IRC Carriageway Standards for 2-Lane Roads
The Indian Roads Congress (IRC:73 for rural highways and IRC:86 for urban roads) defines standard lane dimensions based on vehicle design envelopes and passing clearance safety margins.
For a standard two-lane two-way highway, the standard carriageway width is 7.0 meters (3.5 meters per traffic lane). If raised kerbs or paved shoulders are provided, the carriageway is widened to 7.5 meters.
- Standard 2-lane carriageway (without kerbs): Exactly 7.0 meters (3.5 meters per lane)
- Standard 2-lane carriageway (with kerbs/paved shoulders): 7.5 meters
- Single lane standard: 3.75 meters for single-lane rural roads
- Intermediate lane standard: 5.5 meters for intermediate carriageways without paved shoulders
Right of Way (ROW) and Earthen Shoulders
Beyond the central paved carriageway, the complete road cross-section incorporates paved and earthen shoulders, side drainage ditches, and the statutory Right of Way (ROW).
Shoulders provide recovery space for errant vehicles and emergency stopping areas for agricultural tractors and commercial trucks, typically measuring 1.5 to 2.5 meters on each side.
- Paved shoulder width: 1.5 meters on both sides along National and State Highways
- Earthen shoulder width: 1.0 to 1.5 meters of compacted gravel alongside paved surfaces
- Right of Way (ROW) - Rural National Highways: 30 to 45 meters total land width reserved for future expansion
- Right of Way (ROW) - Major District Roads: 20 to 30 meters total width
Rural Road Dimensions Under PMGSY
Under the Pradhan Mantri Gram Sadak Yojana (PMGSY), rural farm-to-market roads are engineered to connect remote agricultural villages with wholesale mandis and state highway networks.
PMGSY roads typically utilize single-lane (3.75 meter) or intermediate (5.5 meter) carriageways with a 7.5 meter total roadway embankment width, accommodating heavy grain transport trucks and tractor-trolleys.
- PMGSY roadway width: 7.5 meters total formation width including gravel shoulders
- Paved surface (PMGSY): 3.75 meters single lane or 5.5 meters intermediate lane asphalt surface
- Design speed: 40 to 50 km/h design speed for rural agricultural freight transit
- Cross drainage: Mandatory concrete pipe and box culverts designed to withstand monsoon flood discharges
Official source
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Ministry of Road Transport and Highways (MoRTH) ↗Related on KisanPe
Common questions
What is the standard carriageway width of a 2-lane road in India?
Under Indian Roads Congress (IRC) standards, a 2-lane road has a standard carriageway width of 7.0 meters (or 7.5 meters if raised kerbs or paved shoulders are provided).
What is the width of a single traffic lane on Indian highways?
A single standard highway traffic lane measures 3.5 meters in width.
What are the standard road dimensions under PMGSY for rural connectivity?
PMGSY rural roads typically have a paved carriageway width of 3.75 meters within a total 7.5 meter formation width including compacted shoulders.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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