Context
The National Highways Authority of India (NHAI) has issued new guidelines for high-speed corridors as India targets 50,000 km by 2036–37, up from 3,052 km in December 2025.
About High-Speed Corridors
- High-speed corridors are access-controlled national highways or expressways designed for fast, uninterrupted long-distance travel.
- They restrict local traffic through planned entry and exit points to improve safety and traffic flow.
Key Features of the New Guidelines
- Traffic-Based Planning
- Traffic assessment will cover existing, generated, induced and diverted traffic using scientific modelling.
- Freight growth will be linked to economic activity, with data cross-checked using toll records, GST and mining department data.
- Vehicle Damage Factor (VDF) will also be validated to improve pavement design.
- Lane capacity will be based on current and projected traffic demand.
- Access Control
- No at-grade road intersections will be allowed; entry and exit will be through designated ramps.
- Service roads and drain-cum-footpaths will be provided in built-up areas.
- Underpasses may have a height of 5 metres where heavy agricultural machinery is commonly used.
- Signage and Road Markings
- Overhead signs will be placed 5 km and 2 km before exits, while cantilever signs will be placed 1 km and 500 metres before exits.
- Lane markings: 150 mm; edge markings: 200 mm.
- Barrier-Less Tolling and Corridor Protection
- Multi-Lane Free Flow (MLFF) tolling will be considered from the initial design stage, allowing vehicles to pass without stopping.
- A 1-metre-high Reinforced Cement Concrete (RCC) wall will protect the outer Right of Way (ROW) from encroachment.
- ROW is the legally acquired land reserved for highway construction, operation and future expansion.
- Environmental Measures
- Drip irrigation will be provided in highway medians.
- Tree plantation will be included from the Detailed Project Report (DPR)
Significance
- Standardisation: Ensures uniform design and construction practices across projects.
- Efficient planning: Traffic-based design helps match road capacity with actual demand.
- Road safety: Access control, ramps, signage and service roads reduce traffic conflicts.
- Future-ready infrastructure: Early integration of MLFF and environmental measures reduces the need for costly changes later.
- Vision 2047: Supports India’s target of expanding high-speed corridors from 3,052 km to 50,000 km by 2036–37.
Conclusion
NHAI’s guidelines provide a uniform framework for safer, efficient and future-ready high-speed corridors, supporting the systematic expansion of India’s national highway network.
FAQs
Q1. What are high-speed corridors?
Ans: They are access-controlled national highways designed for uninterrupted long-distance movement with limited local traffic interference.
Q2. How will lane requirements be decided?
Ans: Lane configuration will be based on existing and projected traffic, supported by traffic modelling and cross-validated data.
Q3. What is Multi-Lane Free Flow (MLFF) tolling?
Ans: MLFF is a barrier-less tolling system that allows vehicles to pass through toll points without stopping at conventional toll barriers.
Q4. What is the Right of Way (ROW) of a highway?
Ans: ROW is the legally acquired land available to the road authority for construction, operation, maintenance and future expansion of the highway.
