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Peak Hour Factor (PHF) is used to represent the proportion of peak sub-hourly traffic flow within the peak hour. If 15-minute sub-hours are considered, the theoretically possible range of PHF will be

1. (A) 0 to 1.0
2. (B) 0.25 to 0.75
3. (C) 0.25 to 1.0
4. (D) 0.5 to 1.0

Correct answer: (C) 0.25 to 1.0

Solution

The Peak Hour Factor (PHF) quantifies the variability of traffic flow within a peak hour, and since it is based on the ratio of the total flow to the maximum flow in any 15-minute sub-period, it can theoretically range from 0.25 (indicating very uneven distribution) to 1.0 (indicating uniform distribution).

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