Full Breakdown
New NHAI Guidelines Standardise Design of India’s High-Speed Access-Controlled Corridors
By Drooid · · How we work
Core Event
The National Highways Authority of India (NHAI) issued comprehensive design and safety guidelines for upcoming four-lane and six-lane access-controlled high-speed national highways that are not classified as expressways. The rules, announced on a Monday, apply to all greenfield and brownfield projects and replace the previous absence of dedicated standards for such corridors.
Background & Context
India’s road network has long lacked uniform technical specifications for high-speed highways that differ from expressways. Variations in Detailed Project Reports (DPRs) have led to inconsistent lane widths, safety features, and access-control measures. The new framework fills this regulatory gap, aligning with the government’s “Viksit Bharat 2047” roadmap, which envisions 50,000 km of access-controlled high-speed corridors by 2047. At the time of the announcement, 3,052 km of such corridors were already operational.
Data & Statistics
| Traffic Volume (vehicles/day) | Highway Configuration | Right-of-Way Width |
|---|---|---|
| Up to 15,000 | Four-lane highway with four-lane structures | 60 m |
| 15,000 – 25,000 | Four-lane highway with six-lane structures | 70 m |
| 25,000 – 40,000 | Six-lane highway with six-lane structures | 70 m |
- Additional safety provisions include:
- Flush medians (painted centre lanes with wire ropes or crash barriers) instead of raised concrete dividers.
- No median openings or at-grade (surface-level) intersections.
- Advance exit signage at 5 km, 2 km, 1 km and 500 m before exits.
- One-metre-high boundary walls along the outer edge to deter stray cattle and unauthorised entry.
- Collapsible barriers permitted 5 km from the main carriageway for emergency and maintenance vehicles.
- Crash cushions at merging points and metal crash barriers on bridges, tunnels and overpasses.
Why It Matters / Impact
Standardising lane configurations and safety features is intended to reduce conflict points, lower the risk of high-speed crashes, and improve traffic flow on corridors where speeds can reach 100 km ph. Uniform signage and geometric design aim to give drivers sufficient warning for lane changes and exits, enhancing operational efficiency. The boundary walls address the chronic “cattle menace” that has caused accidents on Indian highways. By providing ramp-based interchanges at major crossings and connections to ports, airports, Multi-Modal Logistics Parks, industrial hubs and tourist destinations, the guidelines support smoother freight movement and could help reduce logistics costs nationwide.
Verbatim Quotes
- “Variations have been observed in the standards adopted for preparation of DPR for such corridors. The new guidelines address this requirement by providing a uniform set of technical and safety provisions,” — The NHAI
What’s Next
The guidelines are now the reference for preparing DPRs for all future high-speed access-controlled corridors. Under the Viksit Bharat 2047 plan, the government will continue to approve new greenfield and brownfield projects that conform to the standards, with the ultimate goal of reaching the 50,000 km target. Implementation of the one-metre boundary walls, flush medians and ramp interchanges will be monitored as each corridor progresses through construction and commissioning phases.