Equation 7.1 indicates that the further the PHF is from unity,the more peaked or nonuniform the traffic flow during the hour.For example,consider two roads both of which have a peak-hour volume,V,of 2000 veh/h.The first road has 1000 vehicles arriving in the highest 15-min interval,and the second road has 600 vehicles arriving in the highest 15-min interval.The first road has more nonuniform flow,and this is substantiated by the fact that its PHF of 0.5 is further from unity than second road'sPHF of 0.83.