The minimum road width in a mountainous and steep terrain depends on various factors, including the local topography, traffic volume, vehicle types, design standards, and safety considerations. In such challenging terrains, road engineers must account for factors like curvature, gradient, visibility, and the need for adequate space for vehicles to manoeuvre safely.

 

Road type	Road width
	Plain and Rolling	Mountainous and Steep Terrain
National/State Highway	12	6.25-8.8
Major District Road	9	4.75
Other District Road	7.5-9.0	4.75
Village Road	7.5	4