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

Peak Hour Factor (PHF) is used to represent the proportion of peak sub

1.	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
A.	0 to 1.0
B.	0.25 to 0.75
C.	0.25 to 1.0
D.	0.5 to 1.0
Answer» D. 0.5 to 1.0