Civil Engineering MCQAE Level Civil Engineering
Traffic flow is 1200 veh/h and density is 50 veh/km. Space mean speed is
Transportation EngineeringOriginal practiceMEDIUM
Choose the correct answer
A
48 km/h
B
12 km/h
C
24 km/h
D
34 km/h
Correct Answer
C. 24 km/h
Why is this the answer?
Fundamental traffic flow equation: q = k × v, so v = q / k. Here q = 1200 veh/h (flow rate), k = 50 veh/km (traffic density). Space mean speed v = 1200 / 50 = 24 km/h km/h. This relationship (Greenshields model) shows speed decreases as density increases toward jam density.
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