Identify the correct pairs from the following with respect to the minimum road way width in a mountainous and steep terrain.

Road Type

Minimum Road Way Width

Single-lane major district roads

5.75 m

Single-lane other district roads

4.75 m

Single-lane village roads


4.00 m 

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  1. Only 1 and 3
  2. Only 1 and 2
  3. Only 2 and 3 
  4. 1, 2 and 3

Answer (Detailed Solution Below)

Option 3 : Only 2 and 3 
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Explanation:

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 maneuver safely.

As per IRC, minimum roadway width are following, 

Road type

Roadway 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

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