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As per IRC the minimum width of carriage way for single lane road is
50 m
75 m
m
m
75 m
According to the Indian Roads Congress (IRC) standards, the minimum width of the carriageway for a single-lane road is specified as 3.75 meters. This dimension ensures sufficient space for a standard design vehicle (typically 2.44 meters wide) to pass safely within the lane while accounting for lateral clearance.
According to the Indian Roads Congress (IRC) standards, the minimum width of the carriageway for a single-lane road is specified as 3.75 meters. This dimension ensures sufficient space for a standard design vehicle (typically 2.44 meters wide) to pass safely within the lane while accounting for lateral clearance.
W=VwтАЛ+2├ЧCwтАЛ тАФ where W is carriageway width, VwтАЛ is vehicle width, and CwтАЛ is side clearance.
The carriageway width is derived from the width of the design vehicle plus additional clearance on either side for safe operation. For a single-lane road, the IRC recommends a 3.75 m width, which allows for vehicle width, safety margins, and small maneuvering errors without requiring vehicles to encroach upon the road shoulders frequently.
Standard width for single lane is 3.75 m.
For two-lane roads without raised kerbs, the width is 7.0 m.
Width increases in mountainous terrain or based on project-specific requirements.
IRC codes act as the primary guidelines for highway geometric design in India.
Ensures safe passage for heavy vehicles.
Reduces risk of edge damage and vehicle tires going off the pavement.
Requires higher land acquisition costs compared to narrower rural tracks.
Increases construction material quantities.
Rural road development (PMGSY).
Minor district roads and village connectivity.
The option '75 m' in the question is a typographic error for '3.75 m'.
In hilly regions, the minimum width for a single lane road is sometimes reduced to 3.0 m due to topographic constraints.
B is correct тАФ As per IRC:73, the minimum carriageway width for a single-lane road is 3.75 m.
Always remember that for two-lane roads, the IRC recommendation is 7.0 m if there are no raised kerbs; if kerbs are provided, it is usually 7.5 m.