Sight Distance MCQ with answer and solution

Concept

Speed of Overtaken Vehicle

Formula

Vb = V - 16 (where Vb is the speed of the overtaken vehicle and V is the speed of the overtaking vehicle in km/h)

Step-by-step solution

Subtract 16 km/h from the overtaking vehicle's speed: 80 - 16 = 64 km/h.

Explanation

According to IRC guidelines, if the speed of the overtaken vehicle is not explicitly given, it is assumed to be 16 km/h less than the speed of the overtaking vehicle. Therefore, 80 km/h minus 16 km/h equals 64 km/h.

Shortcut

Subtract 16 km/h from the design/overtaking speed (V - 16). A helpful mnemonic is to remember "Sweet 16"—the overtaken vehicle is always 16 km/h slower.

Common mistake

Many students mistakenly subtract 15 km/h instead of the standard IRC reduction of 16 km/h, leading them to choose 65 km/h (Option A) instead of the correct 64 km/h (Option B).