Sight Distance MCQ with answer and solution

Concept

Intermediate Sight Distance

Formula

ISD = 2 × SSD

Step-by-step solution

Multiply the Stopping Sight Distance (SSD) by 2: ISD = 2 × 180 m = 360 m.

Explanation

Intermediate sight distance (ISD) is defined as twice the stopping sight distance (SSD). Given a stopping sight distance of 180 m, the intermediate sight distance is calculated as 2 multiplied by 180 m, which equal 360 m.

Shortcut

Just remember: ISD is double the SSD (ISD = 2 × SSD). Simply double the given stopping sight distance value.

Common mistake

Students often confuse Intermediate Sight Distance (ISD) with Overtaking Sight Distance (OSD) or mistakenly divide the Stopping Sight Distance (SSD) by 2 instead of multiplying it by 2 (ISD = 2 × SSD).