India’s First Smart Elevated Corridor: A Benchmark in Safety, Sustainability and Urban Mobility – A Case Study of the G.D. Naidu Flyover, Coimbatore, India

Indias First Smart Elevated Corridor: A Benchmark in Safety, Sustainability and Urban Mobility – A Case Study of the G.D. Naidu Flyover, Coimbatore, India

Dr. V. Samuthirakani, M.E., Ph.D.

Divisional Engineer (Highways), Special Projects Division, Coimbatore, India

Er. V. Agila, Er. M. Maheswari,

Asst. Divisional Engineer (Highways), Special Projects Division

Er. R. Vignesh, Er. C. Karthikeyan, Er. C. R. Nandhini

Asst. Engineers (Highways), Special Projects Division

Abstract – The G.D. Naidu Elevated Corridor on Avinashi Road, Coimbatore, is a rare example of an urban transport project in which structural engineering, construction methodology, traffic safety, water management, intelligent systems, landscaping, and urban aesthetics have been integrated into a single continuous corridor. Rather than functioning only as a grade separator, the project has been developed as a comprehensive urban infrastructure system addressing mobility, safety, durability, environmental performance, and visual identity.

The 10.1 km long facility, constructed at a cost of approximately Rs. 1791.23 crores, includes multiple access provisions comprising 4 intermediate up-ramps and 4 down-ramps, ensuring efficient traffic distribution across a high-density urban network.

The corridor incorporates advanced structural systems such as pile and open foundations, portal beam arrangements in ramp portions, precast strutted segmental box girders, epoxy-bonded segmental assembly, staged prestressing operations, and a 52 m steel composite railway span. Riding quality and durability are enhanced through mastic asphalt, bituminous concrete surfacing, and sinus plate expansion joints.

A multilayered safety framework is provided through high-containment RCC crash barriers, continuous metal beam barriers, roller crash barriers, solar-powered blinkers, speed control measures, and advanced signage systems. Sustainability features include rainwater harvesting with 250 recharge pits, drip and sprinkler irrigation, and extensive corridor landscaping. Intelligent transport systems comprising AI cameras and video walls further enhance monitoring and user information.

The study establishes the corridor as a replicable model for integrated urban elevated infrastructure in dense city environments.

Keywords: Urban elevated corridor; segmental box girder; smart corridor; sustainability; urban infrastructure; Coimbatore

1. INTRODUCTION

   1. Importance of Avinashi Road Corridor

      Avinashi Road is one of the most critical arterial corridors in Coimbatore, functioning as a primary urban spine connecting key activity centres such as the Coimbatore International Airport, major bus terminals, commercial districts, and residential areas. The corridor experiences continuous 24-hour high-intensity traffic [1] due to diverse trip purposes including airport access, intercity travel, daily commuting, and institutional movement.

      Fig 1. G.D.Naidu Elevated Corridor, Coimbatore

      A wide range of high-attraction land usesincluding multi-speciality hospitals, educational institutions, shopping malls, offices, schools, and retail establishmentsare located along both sides of the corridor. This results in sustained and heterogeneous traffic demand [2] throughout the day, leading to severe congestion, delay, and operational inefficiencies prior to the construction of the elevated corridor. Frequent junctions, pedestrian activity, frontage access, and mixed traffic conditions further intensified these challenges, necessitating a grade-separated mobility solution.

      Category	Feature	Engineering Purpose	Key Benefit
      Structural	Strutted box girder	Efficient load transfer	Stability & aesthetics
      Structural	Segmental construction	Rapid erection	Minimal traffic disruption
      Structural	Epoxy bonding	Joint integrity	Durability
      Structural	Steel composite span	Long span crossing	Reduced self-weight
      Foundation	Pile & open foundation	Site adaptability	Cost optimization
      Safety	RCC crash barrier	Vehicle containment	High safety
      Safety	Metal beam barrier	Vehicle redirection	Continuous protection
      Safety	Roller crash barrier	Energy absorption	Reduced accident severity
      Safety	Speed breakers	Speed control	Safer ramp exit
      Smart	AI cameras	Violation detection	Enforcement
      Smart	Video walls	Information display	Awareness
      Pavement	Mastic asphalt	Waterproofing	Deck protection
      Pavement	BC layer	Riding quality	Comfort
      Joint	Sinus expansion joint	Smooth movement	Low noise
      Marking	Thermoplast ic	Visibility	Long life

      Urban elevated corridors in India are traditionally designed to improve traffic flow by separating through traffic from local movements.

      Table 1.Traffic Census Summary

      However, modern infrastructure expectations extend beyond mobility to include durability, construction efficiency, safety, environmental performance, urban aesthetics, and long-term maintainability [3].

      The G.D. Naidu Elevated Corridor represents a significant shift from conventional design by integrating multiple engineering and architectural features within a single continuous system. These include advanced segmental superstructure technology, staged prestressing, special spans, comprehensive safety systems, smart surveillance, rainwater harvesting, irrigation-supported landscaping, decorative lighting, and culturally inspired architectural elements. Thus, the corridor functions not merely as a transport facility but as an integrated urban infrastructure asset.

      The project is particularly notable due to its execution along a densely developed urban corridor. Constructing a 10.1 km elevated facility under such conditions required careful planning to minimize disruption while ensuring structural efficiency and safety. The corridor therefore provides an important case study demonstrating how engineering, construction strategy, and urban design can be effectively integrated.

      This paper focuses on the physical, technical, sustainability, and aesthetic features of the corridor, while detailed economic and operational analyses are presented separately by the author. The study aims to document the project as a benchmark model for future urban elevated corridor development.

      Objectives of the Study

      1. To document the structural, safety, smart-system, sustainability, and aesthetic features of the corridor in a systematic manner.

      2. To explain the engineering purpose and urban significnce of key features.

      3. To demonstrate the integration of multiple infrastructure systems within a single corridor.

      4. To establish the project as a benchmark model for future urban elevated corridors.

         Table 2. Summary of major corridor features and their engineering purpose

         Category	Feature	Engineering Purpose	Key Benefit
         Marking	Reflective studs	Night guidance	Safety
         Marking	Solar studs	Self illumination	Energy saving
         Marking	Solar blinkers	Warning system	Accident prevention
         Water	Rainwater harvesting	Groundwater recharge	Sustainability
         Irrigation	Drip irrigation	Water efficiency	Plant survival
         Irrigation	Sprinkler irrigation	Uniform coverage	Healthy landscaping
         Landscaping	Bougainville a	Visual identity	Beautificatio n
         Landscaping	Cypress/pal ms	Urban greenery	Cooling effect
         Lighting	LED poles	Illumination	Energy saving
         Lighting	Decorative lighting	Aesthetics	Night appeal
         Architecture	Gopuram pylons	Cultural identity	Landmark value
         Protection	Pier protection wall	Structural safety	Impact resistance

2. PROJECT BACKGROUND AND CORRIDOR OVERVIEW

   The G.D. Naidu Elevated Corridor is located along Avinashi Road in Coimbatore, Tamil Nadu, extending approximately

   10.1 km between Uppilipalayam and Goldwins. The corridor serves as a major urban arterial carrying mixed traffic, including airport-bound, commercial, institutional, and residential movements, and was previously affected by congestion due to intersections, roadside activity, and traffic conflicts.

   Fig 2. Down Ramp

   The project was conceived to provide uninterrupted through-movement while retaining and enhancing at-grade road functionality. Accordingly, the corridor operates as an integrated system, where the elevated carriageway carries through traffic and the at-grade system supports local access, drainage, landscaping, lighting, and urban infrastructure elements.

   Multiple ramps, including intermediate access points, improve traffic distribution and network connectivity. Beyond its transport function, the corridor incorporates a wide range of structural, safety, environmental, and aesthetic components such as advanced superstructure systems, crash barriers, smart surveillance, irrigation-supported landscaping, rainwater harvesting, and coordinated urban design features.

   The project is particularly significant as it demonstrates how an elevated corridor can function as a comprehensive urban infrastructure asset rather than merely a traffic facility. The integration of architectural elements, landscaping, and lighting contributes to a strong corridor identity while enhancing the surrounding urban environment.

3. STRUCTURAL AND CONSTRUCTION FEATURES

   1. Foundation Systems and Pile Load Testing

      The corridor adopts a combination of pile foundations and open foundations based on location-specific geotechnical conditions, structural loads, and construction constraints. In long urban corridors, soil characteristics and utility interferences vary significantly, making a uniform foundation system impractical. Pile foundations are used in weaker strata to transfer loads to deeper competent layers, ensuring stability and settlement control, while open foundations are adopted in locations with adequate bearing capacity to optimize cost and constructability.

      Fig 3. Initial Pile load test.Anchor Pull out method

      To ensure the reliability of foundation performance, pile load testing [4],[5] was carried out as part of the construction verification process. Static load tests were conducted using incremental loading to evaluate loadsettlement behaviour and confirm design capacity. In addition, dynamic load testing techniques were adopted for rapid assessment of multiple piles, ensuring consistency across the corridor. In constrained locations, pull-out (tension) tests were also performed to verify uplift resistance. These tests collectively ensured that all foundation elements met the required safety and performance criteria.

      Component	Type	Function	Engineering Significance	& approa
      Foundation	Pile/Open	Load transfer	Adaptability to soil
      Pier	RCC	Vertical support	Stability
      Portal Beam	RCC	Ramp support	Space optimization
      Superstructu re	Pre cast Segmental Box girder	Deck support	Torsional rigidity
      Prestressing	Longitudinal/ Lateral	Strength enhancement	Crack control
      Railway Span	Steel composite	Long span crossing	Lightweight & efficient
      Approach Ramp	ReRinefionrfcoerdced E earWthawll)all	aSoil retention &rthapWpraolla(cRhE formation	Space- efficient, eScooinl oremteincatilon formation & rapid construction

      Table 3: Structural System Components

      Fig 4. Dynamic Pile Load Test

   2. Portal Beam Structures in Ramp Portions

      Ramp sections involve complex geometry due to merging, diverging, and space constraints near junctions. Portal beam structures were adopted in these zones to maintain structural continuity while minimizing obstruction to traffic below. These systems efficiently transfer loads while accommodating geometric requirements and contribute to both structural performance and visual organization of ramp areas.

      Fig 5. Portal Beam

   3. Strutted Segmental Box Girder System

      The superstructure consists of a strutted segmental box girder system, which is highly suitable for urban elevated corridors due to its torsional rigidity, structural efficiency, and clean profile. The closed box section performs well under curved alignments and eccentric loading, while the strutted configuration enhances load distribution and provides a distinct architectural identity [6],[7].

   4. Segmental Construction and Prestressing Methodology

      Segments were cast in a controlled yard environment and laterally prestressed prior to transportation. After erection at site, longitudinal prestressing was carried out to integrate the segments into a continuous structural system. This staged prestressing approach ensures quality control, reduces on-site complexity, and improves structural performance by controlling cracking and enhancing durability [8],[9].

      Fig 6. Segmented Box Girder.

      Segmental assembly and launching at site minimize disruption to traffic, making this approach particularly effective in dense urban environments. The method reflects

      moder construction practices emphasizing prefabrication, speed, and safety.

      Fig 7. Segment Launcher.

   5. Bridge Bearings System (PotPTFE Bearings

      Bridge bearings play a critical role in transferring loads from the superstructure to the substructure while accommodating movements and rotations induced by traffic loads, temperature variations, creep, and shrinkage. In this project, PotPTFE bearings have been adopted due to their high load-carrying capacity, durability, and ability to accommodate multidirectional movements.

      The pot bearing consists of an elastomeric disc confined within a steel pot, which behaves like a fluid under pressure, allowing rotational movements. The PTFE (Polytetrafluoroethylene) sliding surface facilitates low-friction translational movement, ensuring smooth response under thermal and traffic-induced displacements.

      Fig.8. Pin Bearing

      Different types of bearings have been strategically provided based on functional requirements:

      • Fixed Bearings: Restrict all translational movements and allow only rotation; used to anchor the superstructure.

      • Guided Bearings: Permit movement in one direction while restraining the other, ensuring controlled longitudinal displacement.

      • Free Bearings: Allow movement in all horizontal directions, accommodating thermal expansion and contraction.

      • Pin Bearings: Facilitate rotation with limited translational movement, used in specific locations requiring rotational flexibility.

      The selection and placement of these bearings ensure optimal distribution of forces, minimize stress concentration in structural elements, and enhance the overall serviceability and longevity of the elevated corridor.

      1. Reinforced Earth Wall System Reinforced earth walls [10] have been constructed at both main ramps and all eight intermediate ramps to facilitate smooth approach transitions and grade separation.

         Fig.9. Geo Strips in RE Wall

         These systems provide an efficient and economical solution for retaining earth while accommodating space constraints in urban environments.

         Fig 10. RE wall for Ramp

         By using reinforced backfill with facing panels, the walls ensure stability, reduce lateral earth pressure, and allow rapid

         construction. The adoption of reinforced earth walls also minimizes land requirements and integrates well with the overall structural and geometric configuration of the corridor.

      2. Steel Composite Railway Span

      A 52 m steel composite span was provided to cross railway lines, addressing clearance constraints and minimizing disruption to rail operations. [11] The composite system combines the tensile strength of steel with the compressive properties of concrete, enabling longer spans with reduced self-weight. This feature highlights the structural adaptability of the corridor to site-specific challenges.

      Fig 11. Second Level ROB

      Fig 12. Launching of Steel Girders.

4. PAVEMENT, RIDING QUALITY, AND DECK ACCESSORIES

   The performance of an elevated urban corridor is not determined solely by its structural system, but also by the quality of its deck surfacing and accessories, which directly influence user comfort, durability, and long-term maintenance. In the G.D. Naidu Elevated Corridor, the pavement and deck systems have been designed as an integrated solution to address riding quality, waterproofing, and structural protection under continuous high-intensity traffic conditions [12], [13].

   1. Sinus Plate Expansion Joints

      Expansion joints [14] are essential components in bridge structures, allowing for thermal expansion and contraction, shrinkage, creep, and other structural movements. However, in heavily trafficked urban corridors, conventional expansion joints often become sources of discomfort and maintenance issues due to their tendency to generate impact loads, noise, vibration, and leakage.

      Fig 13. Sinus Plate Expansion Joint

      To overcome these limitations, sinus plate expansion joints have been adopted in the G.D. Naidu Elevated Corridor. Unlike conventional joints, the sinusoidal geometry provides a smooth and gradual transition for moving vehicles. This significantly reduces impact effects when vehicles pass over the joint, resulting in improved riding comfort and reduced dynamic loading on the structure.

      From an engineering perspective, the use of sinus plate joints minimizes localized stress concentrations and reduces wear and tear at joint interfaces. The smoother load transfer mechanism enhances durability and lowers maintenance frequency. Additionally, reduced noise and vibration are particularly beneficial in dense urban environments, where user comfort and surrounding environmental quality are critical considerations.

      Since the perception of an elevated corridor by users is strongly influenced by ride smoothness and noise levels, the adoption of sinus plate expansion joints represents a key design intervention aimed at improving both structural performance and user experience.

   2. Deck Surfacing System Mastic Asphalt Layer

      The elevated corridor is configured as a four-lane divided carriageway, designed to carry uninterrupted through traffic subjected to continuous loading and environmental exposure. To ensure durability and long-term performance, a mastic asphalt layer has been provided as an intermediate waterproofing course over the deck.

      Mastic asphalt is characterized by its dense, impermeable, and flexible properties, making it highly suitable for bridge deck applications. It effectively prevents water ingress into the deck slab, thereby protecting reinforcement and concrete from deterioration caused by moisture and environmental effects.

      Fig 14. Mastic Asphalt Laying

      In the context of a long urban elevated corridor, where exposure to rain, temperature variations, and traffic-induced stresses is continuous, the role of mastic asphalt becomes critical. It acts as a protective barrier that enhances the service life of the structure while reducing maintenance requirements.

   3. Bituminous Concrete Wearing Course

      Above the mastic asphalt layer, a bituminous concrete (BC) wearing course is provided to ensure smooth riding quality and adequate skid resistance. The BC layer directly interacts with vehicular traffic and is therefore designed to provide comfort, safety, and durability under repeated loading conditions.

      The combination of mastic asphalt and bituminous concrete forms a dual-layer surfacing system, where:

      • The mastic asphalt layer provides waterproofing and structural protection, and

      • The BC layer provides riding quality and surface performance.

      This layered approach reflects a well-engineered pavement strategy in which both durability and user comfort are addressed simultaneously, rather than treating deck surfacing as a minimal finishing layer.

   4. Integrated Performance of Deck System

      The integration of sinus plate expansion joints with a dual-layer surfacing system significantly enhances the overall performance of the elevated corridor. Smooth transitions at joints, combined with high-quality surfacing, ensure consistent riding conditions throughout the corridor length.

      In high-speed urban corridors, such integration reduces vehicle-induced vibrations, minimizes structural fatigue, and improves user satisfaction. It also contributes to lower maintenance interventions, which is particularly important in elevated structures where maintenance operations can disrupt traffic flow.

      Thus, the pavement and deck accessories in the G.D. Naidu Elevated Corridor arenot treated as secondary elements but as critical components of overall infrastructure performance, contributing to durability, safety, and user experience.

5. SAFETY AND CRASH PROTECTION FEATURES

   1. High-Containment RCC Crash Barrier of 1.5 m Height

      The elevated corridor is provided with high-containment reinforced concrete crash barriers of approximately 1.5 m height. This is a major safety feature. High-containment barriers are intended to control, redirect, and contain errant vehicles under severe impact conditions, particularly on elevated structures where the consequences of vehicle departure are extremely serious.

      The height and robustness of the barrier indicate that the design prioritizes not only lane delineation but actual containment. In urban flyovers carrying mixed vehicle categories, the barrier must be capable of resisting impact loads while minimizing the risk of vehicle override or breach. A reinforced concrete high-containment barrier provides mass, rigidity, and continuity, all of which are important in such contexts.

      Fig 15. High Containment Crash Barrier

      The significance of this feature also extends to public confidence. A visually substantial barrier communicates safety and protection to users. In technical terms, it enhances the defensive character of the elevated carriageway and acts as a primary safety envelope [15], [16], [17].

      Safety Element	Location	Function	Benefit
      RCC Crash Barrier	Elevated	Containment	Prevent fall-off
      Metal Beam Barrier	Full length	Redirection	Lane discipline
      Roller Barrier	Ramp ends	Energy absorption	Reduced impact severity
      Raised Median	Elevated	Separation	Prevent collisions
      Speed Breakers	Down ramps	Speed control	Safer transition

      Table 4: Safety Features and Functions

      Safety Element	Location	Function	Benefit
      Pier Protection Wall	At-grade	Impact protection	Structural safety

   2. Raised Centre Median of 1.2 m Width

      A raised center median of 0.3 m height and 1.2 m width has been provided. Medians on elevated corridors perform several functions: they separate traffic streams, reduce headlight glare where applicable, assist in visual guidance, and improve traffic discipline by discouraging unsafe crossover movements. When treated with adequate height and form, the median becomes a major safety and operational element rather than a simple divider.

      Fig 16. Continuous Centre Median in Elevated Corridor

      The raised median also contributes to corridor orderliness and can support an organized visual language along the route. In this project, where the corridor is intended to have strong visual identity, the median becomes part of the overall structural and urban design composition.

   3. Continuous Metal Beam Crash Barrier with Aesthetic Painting

      Throughout the corridor length, metal beam crash barriers have been provided and aesthetically painted. Metal beam barriers are commonly used because of their proven redirection performance, relative ease of installation, and adaptability along long alignments. However, the decision to paint them aesthetically across the entire corridor adds an additional visual layer to a standard safety device.

      Fig 17. Metal Beam Crash Barrier

      This integration of utility and appearance is important. In many infrastructure projects, safety elements are left as purely functional items. Here, the metal beam barrier is not only a protective device but also a visual component of corridor identity. This indicates design intentionality at the level of road furniture and not only at the level of major structures.

   4. Roller Crash Barriers at Entry and Exit of Ramps

      Roller crash barriers have been installed at the entry and exit of ramps. These locations are critical because they involve merging, diverging, speed adjustment, and directional change. Errant movements are more likely in such transition zones, especially if drivers misjudge speed or alignment.

      Fig 18. Roller Crash Barrier

      Roller barriers are designed to absorb and dissipate impact energy while redirecting vehicles along the barrier line. Their rotational elements can reduce the severity of impact and assist in channelizing vehicles back into the traffic stream. Installing them at ramp approaches and exits reflects a targeted safety strategy that recognizes the special risk profile of these locations.

   5. Rubber Speed Breakers at Down Ramps

      Speed breakers [18] at down ramps serve as traffic calming devices intended to moderate vehicle speed before vehicles transition from elevated flow to surface-level conditions. Down ramp exits often lead into urban traffic environments with pedestrians, side roads, and local movements. A speed moderation strategy is therefore essential.

      Fig 19. Temporary Rubber Speed breaker.

      The use of rubber speed breakers rather than rigid, harsh devices suggests an attempt to balance effectiveness with user comfort and maintainability. These devices are especially relevant where operational safety at transition points is a priority.

   6. Pier Protection Wall of 2.5 m width witH SS Railing at At-Grade Level

      At the at-grade level, a 2.5 m pier width , 0.9m height protection wall has been provided. Pier zones within urban corridors are susceptible to accidental impact, encroachment, debris accumulation, and in some cases undesirable movement conflicts. A pier protection wall therefore acts as a physical buffer safeguarding the substructure.

      Fig 20 Pier Protection Wall with SS Railings

      The provision of such a protection wall over substantial lengths indicates careful attention to the vulnerability of at-grade structural elements. This is an important but often overlooked component of corridor safety design.

6. GEOMETRIC CONFIGURATION AND TRAFFIC DISTRIBUTION FEATURES

   1. Main Ramps and Intermediate Ramps

      The elevated corridor which has been designed as four lane divided carriageway includes four intermediate up ramps and four intermediate down ramps apart from the main ramps. This distributed ramp system is highly significant in urban elevated corridors because accessibility determines how effectively the elevated facility serves the wider road network. If access is available only at distant terminals, the benefits of the corridor may be concentrated rather than distributed.

      Fig 21. Ramp portion at Night View

      Intermediate ramps allow strategic entry and exit at multiple points, thus improving network penetration and providing flexibility for different trip origins and destinations. They also reduce pressure on terminal ramps by distributing traffic loading and weaving movements.

      From a planning standpoint, these ramps convert the corridor from a purely terminal-to-terminal facility into a more usable urban mobility system. Their inclusion also complicates structural and safety design, which makes the ramp-related engineering features discussed elsewhere in this paper especially important.

   2. At-Grade Six-Lane Configuration

      The at-grade component is designed as a six-lane carriageway. This is a major urban integration feature. Many elevated corridor projects focus heavily on the upper deck while leaving the surface network functionally compromised or visually neglected. In contrast, a six-lane at-grade arrangement shows that the project attempts to maintain strong ground-level road capacity and urban movement even while through-traffic is shifted to the elevated level

      Fig 22. 6 Lane Atgrade Configuration.

      This dual-level design philosophy makes the corridor more complete. The elevated portion handles uninterrupted movement, while the at-grade level remains active, landscaped, lighted, and protected. In publication, the at-grade six-lane provision should be highlighted as evidence that the project is a corridor redevelopment exercise rather than a narrow bridge work.

   3. Elevated Four-Lane Divided Carriageway Configuration

      The elevated corridor is designed as a four-lane divided carriageway to carry uninterrupted through traffic.

      Fig 23. Elevated 4 lane Configuration

      By separating fast-moving vehicles from at-grade movements, it reduces congestion, delays, and conflict points. The divided layout improves safety and traffic discipline, making it well-suited for dense urban conditions. This elevated system complements the at-grade six-lane road, which continues to handle local access and mixed traffic, resulting in an efficient dual-level corridor.

7. SMART CORRIDOR AND INFORMATION SYSTEM FEATURES

   Modern urban infrastructure is increasingly expected to extend beyond physical mobility and incorporate intelligent systems that enhance monitoring, enforcement, and user interaction. In this context, the G.D. Naidu Elevated Corridor represents a significant advancement toward the development of a smart transport corridor, where digital technologies are seamlessly integrated with civil infrastructure to improve operational efficiency, safety, and long-term planning capabilities.

   1. AI Cameras for Violation Detection, Traffic Monitoring, and Data Analytics

      The installation of AI-based surveillance cameras along the corridor is one of its most advanced and defining features. These cameras continuously capture real-time traffic flow and transmit high-resolution video data to a centralized control room, where intelligent software systems process the information for multiple operational purposes.

      Fig 24. AI Enabled Camera

      At the control center, the captured footage is analyzed using AI-enabled algorithms capable of detecting a wide range of traffic violations. These include overspeeding, helmetless riding, seatbelt non-compliance, triple riding, mobile phone usage while driving, wrong-side driving, and unsafe or sudden lane changes. The system is designed to classify violations based on predefined parametersfor example, identifying vehicles exceeding a threshold speed such as 80 km/hand instantly displaying the vehicle registration number along with violation details on the monitoring screens.

      System	Quantity	Function	Benefit
      AI Cameras	44	Violation detection	Enforcement automation
      Video Walls	16	Public display	Awareness
      Solar Blinkers	Multiple	Warning system	Accident prevention

      Table 5: Smart Corridor Systems

      System	Quantity	Function	Benefit
      Solar Studs	Multiple	Night visibility	Energy saving

      This automated detection mechanism significantly reduces reliance on manual enforcement and ensures consistency, accuracy, and rapid response. From a traffic engineering perspective, it enhances behavioural compliance among road users and contributes to improved safety conditions across the corridor [19],[20].

      In addition to enforcement functions, the system also performs continuous analysis of traffic intensity, traffic volume, and flow characteristics. The collected data can be systematically archived and utilized for future research applications, including traffic pattern analysis, congestion studies, level-of-service evaluation, and infrastructure performance assessment.

      The availability of such high-resolution, continuous traffic data creates significant opportunities for advanced research in areas such as AI-based traffic modelling, predictive analytics, intelligent transport systems (ITS), and smart city planning, thereby extending the corridors role from a physical infrastructure asset to a long-term data-driven research platform.

   2. Video Walls and Real-Time Information Systems

      To complement the surveillance system, video walls are installed along the corridor to display real-time information and awareness messages. These systems serve as an interface between the infrastructure and road users, enabling communication of traffic advisories, safety warnings, emergency alerts, and operational instructions.

      Fig 25. Video Wall

      The presence of video walls ensures that the corridor actively engages with users rather than functioning as a passive infrastructure system. Real-time information dissemination is particularly important in high-density urban corridors, where timely communication can influence driver behaviour and enhance safety outcomes.

   3. Integrated Smart Corridor Framework

      The combined deployment of AI cameras and video walls establishes a comprehensive smart corridor framework. Unlike conventional infrastructure, where structural and operational systems function independently, the G.D. Naidu Corridor integrates digital intelligence directly into its physical design.

      Fig 26. Remote Traffic Monitoring

      This integration aligns with contemporary concepts of smart mobility and smart city development, where infrastructure is expected to generate data, support automated decision-making, and enable real-time management. By embedding intelligent systems within the corridor, the project enhances not only traffic movement but also safety enforcement, user awareness, and long-term operational efficiency.

      Thus, the corridor represents a transition from a traditional transport facility to a multi-functional, technology-enabled urban infrastructure system, combining engineering, data analytics, and user-centric design.

8. SIGNAGE, VISUAL COMMUNICATION, AND ROAD FURNITURE

   1. Thermoplastic Road MarkingsThermoplastic road markings have been extensively applied for lane lines, edge lines, stop lines, arrows, and other traffic control symbols. Compared to conventional paint, thermoplastic materials provide superior durability, skid resistance, and retro-reflectivity. This ensures long-lasting visibility under heavy traffic conditions typical of the corridor. Their high luminance enhances driver guidance during both day and night, contributing to improved lane discipline and safety.

   2. Reflective Road StudsReflective road studs have been installed to improve night-time lane delineation and visibility. These studs act as continuous visual guides, particularly under low-light, foggy, or rainy conditions. Their placement along lane edges and median lines enhances alignment perception. They are especially important on elevated sections where edge definition is critical, improving driver confidence and reducing the risk of lane deviation.

      Fig 27. Reflective Road studs

   3. Solar Road Studs Solar-powered road studs have been introduced at critical locations requiring enhanced illumination. These units store solar energy during the day and emit light during night-time without eternal power supply. Their application at curves, ramps, and transition zones improves visibility in high-risk areas. The self-sustaining nature reduces maintenance requirements and ensures reliable performance.

   4. Solar BlinkersSolar blinkers have been installed at key traffic control points such as ramp entries, exits, and junction influence zones.

      Fig 28 .Solar Powered Blinker

      These devices provide active warning through flashing signals, alerting drivers to changes in alignment or traffic conditions. They are particularly effective in highlighting merging traffic and speed reduction zones. Their solar-powered operation ensures reliability with minimal maintenance.

   5. Retro-Reflective and UV-Printed Signage Systems (Including Warning Boards)Retro-reflective signboards integrated with UV-printed graphics have been provided to ensure high visibility, durability, and clarity under all operating conditions. These signs reflect vehicle headlight illumination, maintaining legibility during night travel and adverse weather. The use of UV printing enhances visual quality, color stability, and resistance to environmental degradation.

      Fig 29. Retro Reflective Boards

      Warning boards and information systems are uniformly installed at both elevated and at-grade levels, ensuring consistent and predictable driver guidance. This integrated signage approach improves safety, readability, and overall corridor aesthetics.

      Fig 30. UV Printed Information Boards

   6. Reflective Kerb MarkersReflective kerb markers have been installed along kerb walls to enhance edge visibility. These markers provide a continuous visual reference for roadway boundaries, especially during night-time conditions. Their retro-reflective properties ensure effective illumination under vehicle headlights. This is particularly important on elevated stretches where lateral definition is critical.

   7. Reflective Elements on Crash Barriers and Pier Protection WallsReflective markers have been provided on crash barriers and pier protection walls to improve visibility of structural elements.

      Fig 31. Reflective stickers on Crash Barrier Post.

      These features highlight rigid roadside objects, making them easily identifiable under all conditions. Their presence helps drivers anticipate alignment changes and avoid potential collisions. This measure enhances passive safety across the corridor.

   8. Megalux Reflective Panels Megalux reflective panels have been installed along crash barriers and pier protection walls to provide high-intensity visibility. These panels offer superior retro-reflective performance compared to standard materials. Their continuous arrangement creates a well-defined visual corridor for drivers.

      Fig 32 Megalux Reflective Panel over Crash Barrier

      This is particularly beneficial in high-speed and low-light conditions.

   9. Chevron Boards in CurvesChevron boards have been placed along horizontal curves to indicate direction and

      curvature severity.

      Fig 33. Chevron Boards in Curves

      These boards provide clear visual guidance that helps drivers anticipate alignment changes. Their high-contrast and reflective design ensures visibility in all conditions. This installation significantly improves safety in curved sections.

   10. Gantry-Mounted Destination BoardsGantry-mounted destination boards have been installed at major junctions to provide advance directional guidance.

       Fig 34. Gantry Boards

       These overhead signs ensure high visibility even in dense traffic conditions. Their placement allows drivers to make timely lane choices without abrupt maneuvers. This contributes to smoother traffic flow and reduced confusion at critical points.

   11. Reflective Stickers on Metal Beam Crash Barrier Posts Reflective stickers have been applied on the posts of metal beam crash barriers along the elevated stretch to enhance visibility of the barrier system. These stickers provide intermittent yet continuous visual cues that clearly define the roadway edge during night-time and low-visibility conditions. The retro-reflective surface ensures effective illumination under vehicle headlights without requiring external power. Their uniform placement along the entire stretch improves alignment perception and lateral guidance for drivers. This measure contributes to enhanced safety by reducing the likelihood of unintended vehicle encroachment towards the barrier. [21], [22], [23].

9. LANDSCAPING AND GREEN CORRIDOR FEATURES

   1. Potted Plantation between Metal Beam Crash Barriers

      A distinctive feature of the elevated corridor is the provision of potted plantations within the 1.2 m wide space between metal beam crash barriers.

      Fig 35. Potted Plantation in elevated Level

      The use of multi-coloured bougainvillea combined with golden cypress creates a continuous landscaped strip, enhancing visual quality and establishing a strong corridor identity.

      Fig 36. Potted Plantation in Approach

      Beyond aesthetics, the plantation contributes to functional benefits such as partial glare reduction from opposing traffic during night-time, thereby improving driver comfort. The selection of hardy, climate-adapted species ensures resilience and low maintenance. The arrangement is carefully designed

      to maintain structural clearances, ensure wind stability, and allow maintenance access without affecting barrier performance, demonstrating effective integration of landscape and engineering requirements [24].

   2. At-Grade Plantation and Edge Landscaping

      At the at-grade level, a combination of palm varieties (royal palm, mirchi palm, areca palm), Thuja, and other ornamental species, along with continuous edge plantation, creates a well-defined green corridor.

      Fig 37. Edge Plantation between Pier Protection Wall

      Palms provide vertical visual rhythm, while shrubs and edge planting introduce softness and spatial enclosure, enhancing the corridors character both during day and night.

   3. Green Carpet with Korean Grass

      Korean grass is used as a continuous green carpet in median and landscape zones, improving visual continuity and overall

      neatness.

      Fig 38. Green Grass Carpet between Pier Protection Wall

      It acts as a base layer supporting larger plantation elements and contributes to a well-maintained urban appearance

   4. Landscaping as Environmental Infrastructure

      The landscaping system functions not only as an aesthetic feature but also as environmental infrastructure.

      Fig 39. Landscaping at At-grade Level

      Continuous plantation along the corridor helps in dust control, heat reduction, and visual comfort, while improving public acceptance of large-scale elevated structures. Thus, the green corridor approach enhances both environmental performance and user experience.

10. IRRIGATION AND PLANT MAINTENANCE SYSTEMS

    1. Drip Irrigation for Elevated Plantation

       Providing plantation on or alongside an elevated corridor is only meaningful if long-term survivability is ensured.

       Fig 40. Drip Irrigation at Elevated Level

       The use of drip irrigation for elevated plants is therefore a significant sustainability and maintenance feature. Drip systems deliver water directly to the root zone with high efficiency and minimal wastage. They are particularly appropriate where water conservation and controlled application are important.

       In elevated settings, drip irrigation also reduces splashing, runoff, and unnecessary wetting of structural surfaces compared with broader spray-based systems. It is thus bth a horticultural and structural maintenance-friendly choice.

       Table 6: Landscaping and Irrigation

       Component	Type	Purpose	Benefit
       Median Plants	Bougainville a	Visual appeal	Beautification
       Trees	Palm/Thuja	Urban greenery	Cooling
       Grass	Korean grass	Ground cover	Aesthetic finish
       Irrigation	Drip	Water efficiency	Plant survival
       Irrigation	Sprinkler	Area coverage	Uniform growth

    2. Sprinkler Irrigation for At-Grade Landscaping

       At the at-grade level, sprinkler irrigation has been provided for broader landscape areas. Sprinkler systems are well suited to grassed zones, large planted beds, and wider green strips

       where uniform area coverage is required.

       Fig 41. Sprinkler Irrigation in At-Grade Level

       The combined use of drip and sprinkler systems across different corridor zones demonstrates that the irrigation strategy was matched to plant type and spatial condition. This is a sophisticated feature because it shows that the landscaping was designed as a maintainable long-term system rather than a one-time beautification effort.

11. WATER MANAGEMENT AND RECHARGE FEATURES

    1. Rainwater Harvesting with More than 250 Recharge Pits

       One of the strongest sustainability features of the corridor is the provision of more than 250 rainwater harvesting pits for groundwater recharge. Urban elevated corridors create large impervious surface areas from which runoff can be collected and managed. Instead of treating this runoff only as drainage discharge, the project uses it as a resource for recharge.

       Fig 42. Rain Water Harvesting System

       This approach is highly significant in Indian urban conditions where groundwater depletion, stormwater runoff, and localized water stress often coexist. By creating a distributed recharge system along the corridor, the project transforms linear infrastructure into a water management asset.

       The large number of recharge pits suggests that the system is not symbolic but substantial. It indicates corridor-scale implementation rather than isolated pilot intervention. From a journal standpoint, this is one of the projects most publishable sustainability features.

    2. Integrated Stormwater and Recharge Philosophy

       The importance of the rainwater harvesting system is magnified when understood in relation to drainage design. Efficient collection, conveyance, and controlled diversion

       into recharge structures require planning across the corridor.

       Fig 43. Drainage Pipe Connected to RWH System

       This means the water management system was integrated into the civil design rather than added later. Such embedded sustainability is an important benchmark characteristic , [25], [26].

12. LIGHTING FEATURES

    1. Integrated LED Lighting and Pole Design System.

       Continuous LED lighting is provided throughout the corridor to ensure adequate visibility, safety, and aesthetic enhancement. LED luminaires offer high energy efficiency, long service life, and reduced maintenance, making them suitable for urban infrastructure. Uniform illumination improves night-time safety by enhancing lane visibility,

       structural clarity, and overall corridor legibility.

       Fig 44. Lighting at elevated Level

       The lighting system is supported by aesthetically designed poles that contribute to the visual identity of the corridor. On the elevated section, 9 m high powder-coated poles are provided for durability and uniform lighting coverage, while at the at-grade level, 5.5 m high poles are integrated within the centre median to maintain organized roadside geometry. [27].

       Element	Type	Purpose	Benefit
       LED Lighting	Functional	Visibility	Safety
       Poles	9 m aesthetic	Support	Visual uniformity
       Poles	5.5m, 3 arm poles	Support	Visual uniformity
       Underdeck Lighting	Color changing	Aesthetic	Landmark effect
       Uplighters	Tree lighting	Highlight landscape	Night beauty

       Table 7: Lighting and Aesthetic Systems

       Element	Type	Purpose	Benefit
       Strip Lights	Around piers at junctions	Aesthetic	Landmark effect

       placemaking through infrastructure.

       At major junctions and median openings, three-arm poles are installed to achieve wider and more uniform light distribution in complex traffic areas. All poles are equipped with Lumex LED luminaires, ensuring consistent illumination quality across the corridor.

       Overall, the system reflects an integrated approach combining energy efficiency, safety, and architectural aesthetics.

    2. Tree Uplighters and Stick Lights

       Within landscaped areas, tree uplighters and stick lights have been used to enhance night-time visibility and aesthetic effect. These features are significant because they transform the corridor from a purely illuminated roadway into a curated night-time urban landscape.

       Fg 45. Ornamental Stick Light

       Such lighting can highlight palms, shrubs, pylon features, and planted medians, creating layered visual depth after dark. In publication, these elements can be discussed as part of

       Fig 46. Tree up lighter

    3. Strip Lighting around Junction Piers

       Strip lighting around piers in junction zones creates localized emphasis at critical nodes and improves visibility around structural supports.

       Fig 47. Strip lighting over Pier at Junction

       Since junctions are visually complex and traffic-sensitive areas, lighting treatment at these locations helps both orientation and aesthetics.

    4. Colour-Changing LED Lighting beneath the Deck

       The underside of the deck includes colour-changing LED lighting. This feature has strong symbolic and visual

       significance.

       Fig 48. RGB Lighting at deck bottom in Junctions.

       Under-deck zones in urban elevated projects are often dark, visually neglected, or perceived as dead spaces. By introducing colour-changing lighting, the project transforms the underside into a dynamic visual element.This can significantly change public perception of the corridor, especially in the evening. It creates an identity beyond engineering utility and contributes to the projects iconic character.

13. ARCHITECTURAL, CULTURAL, AND AESTHETIC FEATURES

    1. Pylon Pillars with Traditional Structures at Ramp Ends

       Pylon pillars incorporating traditional forms at the ends of ramps are a remarkable feature because they connect major urban infrastructure with local cultural vocabulary. This creates a sense of place and prevents the corridor from appearing anonymous or interchangeable.

       Fig 50. Decorative Pylons at Ramps

       The use of traditional motifs at ramp terminals is especially appropriate because such locations act as thresholds between elevated and surface movement. Their architectural treatment ca therefore reinforce arrival, departure, and identity.

    2. Temple Gopuram-Inspired Elements at Main Entrance

       At both the main ramp entrance, structures inspired by the Srivilliputhur Andal Temple Towerthe iconic emblem of Tamil Naduhave been prominently incorporated.. This is a highly distinctive cultural feature. The incorporation of a recognizable traditional architectural motif creates local association, civic pride, and immediate visual recall.

       Fig 51. Decorative Cultural Landmark Element Provided at Median of the Elevated Corridor

    3. Attractive Painting over Concrete Structural Components

       The project includes aesthetic painting over piers, deck elements, struts, crash barriers, and related concrete surfaces. Concrete in large linear infrastructure can often appear monotonous and visually heavy. A considered painting scheme can soften this effect, improve legibility, highlight structural form, and reduce the perception of massiveness.

       This is particularly important where the corridor is expected to function as a visual landmark. Painting transforms raw civil structures into finished urban elements.

    4. Coordinated Aesthetic Language across the Corridor

       One of the most important but less tangible features is the coordinated aesthetic language maintained across barriers, lighting poles, boards, plantings, pylons, and structural surfaces. The corridor does not appear as a random accumulation of separate utility items; rather, it reads as an integrated composition. This coherence is one of the primary reasons the corridor can be described as iconic.

14. AT-GRADE CORRIDOR DESIGN QUALITY

    The at-grade corridor deserves separate recognition because it demonstrates that the project extends beyond the elevated deck. The six-lane surface carriageway, pier protection wall,

    green carpet, palm planting, ornamental shrubs, edge plantation, UV-printed signage, LED lighting, and decorative treatment of pier zones show that the surface level was consciously upgraded as part of the overall project vision.

    This is important because large elevated works often cast a physical and psychological shadow on the urban space below. In contrast, the G.D. Naidu Corridor attempts to activate and beautify the ground plane. Such treatment improves civic acceptance and expands the projects benefits beyond users of the elevated deck alone.

15. Integrated Stormwater Drainage and Pedestrian Pathway System

    Throughout the entire stretch of the corridor, a continuous stormwater drain-cum-footpath system has been provided on both sides. This integrated design ensures efficient collection and conveyance of surface runoff while simultaneously offering a dedicated and safe pedestrian walkway.

    Fig 52. Foot Path with Hand Rails over Drain

    The footpath is constructed above the drainage channel with adequate structural support, optimizing the use of available space in a dense urban environment. Continuous handrails are provided along the footpath to enhance pedestrian safety, particularly in high-traffic zones. This approach reflects a holistic infrastructure design philosophy, where drainage and pedestrian facilities are combined into a single functional system, improving both utility and urban usability of the corridor. [28]

16. Bus Lay-byes and Passenger Shelters

    At essential locations along the corridor, dedicated bus lay-byes [29] and passenger shelters have been provided to facilitate safe and efficient public transport operations. The bus lay-byes are designed as recessed bays separated from the main traffic stream, allowing buses to stop without obstructing through traffic, thereby maintaining smooth traffic flow. These lay-byes are strategically located near major activity zones such as commercial areas, institutions, and residential clusters to ensure accessibility for commuters. Passenger shelters are provided in conjunction with the lay-byes, offering protection from weather conditions and

    improving user comfort. This integrated provision supports public transport usage, enhances pedestrian safety, and reflects a balanced corridor design that accommodates both private and public transport systems.

17. COMPARATIVE INTERPRETATION: WHY THIS CORRIDOR IS DISTINCTIVE

    A useful way to interpret the project is to compare it with a typical urban flyover or elevated road. Conventional projects may include a repetitive superstructure, basic barriers, limited signage, standard lighting, and minimal landscaping. The G.D. Naidu Corridor goes considerably further by integrating the following in one continuous project:

    • Adaptive foundation systems

    • Portal beam ramp structures

    • Staged yard-to-site segmental prestressing

    • Special steel composite railway span

    • High-containment RCC barriers

    • Roller barriers at targeted ramp locations

    • Raised medians and pier protection systems

    • AI cameras and video walls

    • Corridor-wide premium signage and UV-printed boards

    • Elevated and at-grade plantation systems

    • Drip and sprinkler irrigation

    • More than 250 recharge pits

    • Functional plus decorative lighting systems

    • Cultural pylons and regional motifs

    • Aesthetic treatment of structural components

    • Storm water drain cum foot path.

    The importance of this comparison is that it reveals the corridor not as a single-feature project but as a multi-system benchmark. The projects iconic quality lies in the accumulation and integration of many features, each addressing a different dimension of performance.

18. DISCUSSION

    The G.D. Naidu Elevated Corridor demonstrates that the future of urban transport infrastructure lies in integrated design. A major corridor should no longer be seen only as a structural object or a traffic intervention. Instead, it should be understood as a composite urban system containing structural engineering, safety design, surveillance, environmental management, horticulture, public communication, lighting design, and civic symbolism. [3]

    Table 8: Comparison with Conventional Flyover

    Feature	Conventional Flyover	G.D. Naidu Corridor
    Structural System	PSC girder	Strutted box girder
    Safety	Basic barrier	Multi-layer safety, High containment crash barrier
    Smart Systems	None	AI-based
    Water Management	Drain only	RWH system
    Landscaping	Minimal	Full green corridor
    Irrigation	Using tanker manually	Sprinkler irrigation and drip irrigation
    Lighting	Basic	LED + decorative
    Identity	Generic	Cultural landmark

    One of the key lessons from this project is that iconicity in infrastructure does not arise only from scale. A long flyover becomes iconic when multiple systems are deliberately layered into it: a distinctive superstructure, thoughtful ramp treatment, strong safety envelope, intelligent surveillance, water recharge systems, coordinated greenery, ttractive lighting, and cultural markers. In this sense, the corridor moves from being merely large to being complete.

    A second lesson is that sustainability in corridors need not be confined to energy or emissions discussion alone. Rainwater harvesting, irrigation efficiency, maintainable planting systems, and reduced visual harshness through greenery all form part of a wider sustainability framework. Similarly, safety is not limited to crash barriers but extends to information systems, signage, transition control, and lighting.

    A third lesson is that urban acceptability matters. In highly built environments, residents and road users judge infrastructure not only by speed but by how it looks, how it feels, and how it affects the public realm. The coordinated aesthetic treatment in the corridor therefore has serious engineering relevance because it influences long-term civic value.

19. CONCLUSION

    The G.D. Naidu Elevated Corridor in Coimbatore can be regarded as a benchmark urban elevated corridor because it combines engineering performance, construction innovation, safety systems, smart infrastructure, water management,

    landscaping, and visual identity within a single integrated project. Its significance lies not in any one isolated feature but in the way many features have been assembled coherently across the entire corridor.

    Structurally, the project demonstrates advanced solutions through pile and open foundations, portal beam ramp structures, a strutted segmental box girder system, staged prestressing, epoxy-bonded segmental assembly, and a major steel composite railway span. Functionally, it provides smoother riding through specialized surfacing and sinus plate expansion joints. In safety terms, it incorporates high-containment barriers, raised medians, metal beam barriers, roller barriers, speed control devices, pier protection walls, and coordinated signage. In smart corridor terms, it includes AI cameras and video walls. In sustainability terms, it provides large-scale rainwater harvesting, drip and sprinkler irrigation, and extensive planting. In visual and civic terms, it incorporates premium lighting, decorative treatments, pylon features, and culturally resonant motifs.

    Taken together, these features demonstrate a mature model of corridor design suitable for dense urban environments where infrastructure is expected to do far more than carry vehicles. The project therefore offers a valuable reference for future elevated corridor planning in India and elsewhere.

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8. IRC:18-2000, Design Criteria for Prestressed Concrete Road Bridges, Indian Roads Congress.

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25. IRC:SP:42-2014, Guidelines on Road Drainage (First Revision), Indian Roads Congress.

26. IRC:SP:50-2013, Guidelines on Urban Drainage (First Revision), Indian Roads Congress.

27. IRC:90-2010, Guidelines of Selection, Operation and Maintenance of Bituminous Hot Mix Plant, Indian Roads Congress.

28. IRC:103-2022, Guidelines for Pedestrian Facilities (Second Revision), Indian Roads Congress.

29. IRC:SP:12-2015, Guidelines for Parking Facilities in Urban Areas (First Revision), Indian Roads Congress.