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All the vehicles that come during a particular peak hour come during a 10-minute period within this hour. The 15-minute peak hour factor for this peak hour is

1. 0.25
2. 0.167
3. 0.75
4. 1.0

Correct answer: 0.25

Solution

All vehicles arrive in a 10-min window inside the hour, so the busiest 15 min already contains the entire hourly volume V. PHF = V/(4 x peak-15min) = V/(4V) = 0.25, so the stored 1.0 is wrong.

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