Traffic Engineering MCQ with answer and solution

Concept

Spot Speed Measurement

Formula

Yes. Spot Speed (v) = Distance (d) / Time (t), where d is the predefined baseline distance on the road and t is the time taken by the vehicle to traverse that distance.

Step-by-step solution

1. Mark a fixed baseline distance (d) on the road. 2. Use the Enoscope to measure the time (t) taken by a vehicle to cross this distance. 3. Calculate spot speed using the formula: v = d / t.

Explanation

An Enoscope, also known as a mirror box, is a simple instrument used in traffic engineering to measure spot speed. Spot speed is the instantaneous speed of a vehicle as it passes a specific point on a road. The device uses a mirror to reflect the image of a vehicle to an observer, allowing them to accurately time when the vehicle crosses a designated line.

Shortcut

Associate "Eno-SCOPE" with looking at a specific "SPOT" on the road to measure Spot Speed.

Common mistake

Students often confuse spot speed with space-mean speed or time-mean speed because all these parameters involve measuring vehicular speeds, leading them to select Option C or D instead of Option B.