NHAI Sets New Design Standards for High-Speed National Highways; Lane Width and Safety Rules Updated
Add CMV360 on GoogleNHAI has introduced new standards for high-speed National Highways, covering lane configuration, corridor width, safety, boundary walls and ramp-based connectivity.
By Robin Kumar Attri
Key Highlights
New design framework for access-controlled high-speed National Highways.
Applies to upcoming 4- and 6-lane Greenfield and Brownfield projects.
Lane configuration will depend on projected traffic.
1-metre boundary wall mandated for access control and safety.
Ramps planned for major highways and traffic-generating destinations.
The National Highways Authority of India (NHAI) has introduced new guidelines for the planning and design of access-controlled high-speed National Highways. The new framework aims to bring uniformity to highway projects, improve road safety and ensure smoother vehicle movement.
The guidelines will apply to upcoming four- and six-lane Greenfield and Brownfield access-controlled high-speed National Highways, excluding expressways.
Why NHAI Introduced New Highway Design Rules
Until now, separate standards were not available for planning and designing access-controlled high-speed National Highways other than expressways. As a result, different standards were being followed while preparing Detailed Project Reports (DPRs).
The new framework establishes a common set of technical and safety requirements. It is also aligned with the long-term plan to develop 50,000 km of access-controlled high-speed corridors under Viksit Bharat 2047.
Traffic Will Decide Highway Lane Configuration
Under the new guidelines, the number of lanes, structure configuration and corridor width will be decided according to detailed traffic assessments.
Projected Traffic | Highway | Structures | Corridor Width |
Up to 15,000 vehicles | 4-lane | 4-lane | 60 metres |
15,000-25,000 vehicles | 4-lane | 6-lane | 70 metres |
25,000-40,000 vehicles | 6-lane | 6-lane | 70 metres |
This approach is intended to create more consistent planning across high-speed National Highway projects.
New Safety Measures for High-Speed Corridors
The framework introduces additional safety provisions suited to high-speed traffic. Advance notification of highway entries and exits will be provided so motorists have more time to identify upcoming access and egress points and move safely.
NHAI has also mandated a 1-metre-high boundary wall along the outer edge of the highway corridor. The provision is aimed at strengthening access control, preventing unauthorised entry and encroachment, and restricting stray cattle from entering high-speed corridors.
Ramps to Improve Connectivity
Interchanges with ramps will be provided where these highways cross expressways, National Highways, State Highways and important arterial roads carrying substantial traffic.
Ramp-based connections will also be planned for roads leading to major traffic-generating destinations such as ports, airports, Multi-Modal Logistics Parks (MMLPs), industrial areas and major tourist destinations.
Also Read: SDLG India Plans ₹1,500 Crore Investment for Manufacturing Expansion
CMV360 Says
NHAI’s new guidelines create a uniform design framework for upcoming access-controlled high-speed National Highways. By linking lane configuration with traffic demand and adding advance exit-entry signs, boundary walls and ramp-based interchanges, the framework focuses on safer and smoother movement. It also aims to improve consistency in DPR preparation and highway operations while supporting India’s long-term high-speed corridor development plans.
Robin Kumar Attri is a content and video professional with 2.7 years of experience in the commercial vehicle d .....
