The 'peak hour factor' (PHF) in traffic engineering is defined as:
Choose the correct answer
Ratio of peak hour to daily volume
Peak hour volume / (4 × peak 15-minute volume) — measures traffic peaking within the hour
Morning peak to evening peak ratio
Total daily volume / 24 hours
Correct Answer
B. Peak hour volume / (4 × peak 15-minute volume) — measures traffic peaking within the hour
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PHF = peak hour volume / (4 × peak 15-minute volume). PHF ranges 0.25 to 1.0 (1.0 = uniform flow throughout peak hour). Lower PHF = more peaked demand (significant surge in 15 min). Used to convert peak hour volume to peak 15-minute flow rate for capacity analysis: Flow rate = peak hour volume / PHF. Intersection design uses peak 15-min demand.
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