New Delhi: India’s upcoming high-speed National Highways are set for a technology and sustainability upgrade, with the National Highways Authority of India (NHAI) issuing comprehensive guidelines for their planning and design.
The new framework focuses on making high-speed access-controlled National Highways safer, better planned and more prepared for future traffic. It covers upcoming four- and six-lane Greenfield and Brownfield high-speed access-controlled National Highways, other than Expressways.
The guidelines bring together traffic-based planning, modern construction technology, smoother tolling, environmental measures and stronger drainage systems into the highway development process.
Traffic Data to Shape Future Highway Design
One of the major changes is the greater emphasis on data-driven planning.
NHAI’s guidelines require comprehensive assessment of existing traffic as well as future demand. Traffic projections will consider current traffic, diverted traffic and expected growth in freight movement linked to economic and commercial activity.
Toll data and other reliable sources will also be used to make traffic estimates more accurate.
This approach is intended to ensure that highway capacity and design reflect both present requirements and anticipated traffic growth rather than relying only on current traffic volumes.
Earlier NHAI guidelines announced on September 21 also established a uniform framework for preparing Detailed Project Reports (DPRs), with lane configurations linked to traffic assessments.
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AI-Assisted Technology to Enter Highway Construction
The new framework also gives greater importance to technology during construction.
NHAI has provided for the use of Automated and Intelligent Machine-aided Construction (AI-MC) technology for highway embankments and pavements, in line with applicable Ministry of Road Transport and Highways guidelines.
The use of such technology is expected to support greater accuracy, consistency and monitoring during construction.
For large highway projects, technology-enabled construction can also provide project authorities with better visibility into construction activities and quality-related parameters.
MLFF Tolling Planned for High-Speed Corridors
Toll collection is another area covered by the new guidelines.
The framework provides for a shift towards Multi Lane Free Flow (MLFF) tolling on high-speed corridors. Provisions for implementing MLFF will therefore need to be incorporated into the planning of relevant projects.
Unlike conventional toll plazas where vehicles generally pass through designated toll lanes, free-flow systems are designed to enable electronic toll collection without requiring vehicles to stop at traditional toll barriers.
The move is part of the broader effort to make movement along high-speed corridors more seamless.
Green Planning Starts at the Design Stage
Environmental measures will no longer be treated only as additions after highway construction.
The guidelines make landscaping and plantation an integral part of project planning. Suitable locations can include loop areas, spaces below flyovers, medians and other appropriate portions of the highway corridor.
The planning will take into account local climate, topography and environmental conditions.
Another provision focuses on water-efficient maintenance. Drip irrigation systems will be provided on highway medians to support plantations while using water more efficiently and simplifying maintenance.
This places landscaping, plantation and water management within the initial project design rather than treating them as separate post-construction activities.
Drainage Gets a Dedicated Role in DPR Planning
Rainwater management is another key component of the new framework.
NHAI has called for comprehensive drainage planning to be incorporated into the Detailed Project Report process. Plans will identify where rainwater will be discharged and how water from both the highway and surrounding areas will be managed safely.
Water-harvesting structures will also be provided in loop areas and other suitable locations, particularly where there is no natural outlet for rainwater.
Special arrangements will be required around underpasses, flyovers, depressed medians and other structures where water accumulation can create problems.
The drainage plans will clearly identify water-disposal points and provide arrangements for handling rainwater generated both within the highway corridor and from adjoining areas.
What the New Guidelines Mean for Future Highways
The new framework is intended to bring greater consistency to the planning and development of high-speed access-controlled National Highways.
NHAI had earlier noted that separate standards for planning and designing this category of high-speed National Highways, apart from Expressways, were not available, resulting in variations in DPR standards. The new guidelines seek to establish a more uniform technical and safety framework.
The guidelines are also linked to India’s longer-term plan for expanding access-controlled high-speed corridors. The government has outlined a strategic roadmap for developing 50,000 km of access-controlled High-Speed Corridors under its long-term infrastructure vision.
For road users, the broader objective is to create corridors that can handle growing passenger and freight movement while incorporating safety, technology, environmental planning and water management from the project-design stage.
For the highway sector, the framework signals a move towards more standardised planning, technology-supported construction and infrastructure designed around future traffic and environmental requirements.
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