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Spot speed of vehicles observed at a point on a highway are 40, 50 and 25 km/h.… — Answer & Solution | Civexa

Transportation Engineering · Traffic Flow Characteristics

Traffic Flow Characteristics MCQ with answer and solution

Spot speed of vehicles observed at a point on a highway are 40, 50 and 25 km/h. What will be the space mean speed of observed vehicles?

Solution

Concept

Space mean speed

Formula

vs = n / Σ(1/vi)

Step-by-step solution

1. 3/(1/40 + 1/50 + 1/25) = 35.3 km/h ≈ 35.

Explanation

It is the harmonic mean.

Why the other options are wrong

The arithmetic mean is 38.3.

Shortcut

Harmonic mean.

Correct answer: D) 35 km/h

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