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

Horizontal curve radius
Superelevation
Number of lanes
Longitudinal gradient

Correct answer: Horizontal curve radius

Solution

Extra widening is primarily influenced by the horizontal curve radius because sharper curves require additional road width to accommodate vehicles safely, reducing the risk of overturning and improving overall stability during turns.

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