Question

As per the Indian Roads Congress guidelines (IRC 86: 2018), extra widening depends on which of the following parameters?

• A. Horizontal curve radius
• B. Superelevation
• C. Number of lanes
• D. Longitudinal gradient

Hint:

In the IRC guidelines, extra widening is typically considered to maintain safe vehicle operations on curves with different radii, particularly considering the number of lanes and the specific radius of the curve.

Answer 1

The Correct Option is A, C

According to the Indian Roads Congress (IRC 86: 2018) guidelines, the extra widening of curves is based on the following parameters: 1. Horizontal curve radius: The extra widening of a road curve increases with the horizontal curve radius. A smaller curve radius requires more widening to accommodate the vehicle's turning radius. Hence, statement (A) is correct. 2. Number of lanes: The number of lanes affects the widening of the curve. More lanes lead to a higher need for extra widening as the width of the carriageway increases. Therefore, statement (C) is also correct. Thus, the correct answer is (A) and (C).