Question

The following 4 consecutive 15-minute vehicle counts were taken on a highway:

300, 400, 250, 350.

Required:
Compute the hourly flow rates for each period, the total hourly volume, and the peak hour factor.

Answer 1

Answer:

Hourly flow rates are provided below

The total hourly volume is 1,300

Peak hour factor 0.8125

Explanation:

The data can be calculate as below

Time _______ Vehicle count ______ Hourly flow rate

0 - 15 _______ 300 _____________ 4 x 300 = 1,200

15 - 30 ______ 400 _____________ 4 x 400 = 1,600 Maximum

30 - 45 ______ 250 _____________ 4 x 250 = 1,000

45 - 60 ______ 350 _____________ 4 x 350 = 1,400

Hence, Maximum hourly flow rate is 1,600

Calculate hourly volume

Hourly volume = 300 + 400 + 250 + 350 = 1,300

Now calculate Peak hour factor

Peak hour factor = Hourly volume / maximum hourly flow = 1,300 / 1,600 = 0.8125