How to Calculate Design Hourly Volume


Many roads look similar, but in fact, every road is under a different amount of stress based on the vehicle traffic it transports. The amount of traffic that travels a road is a vital factor in determining how much maintenance the road requires from year to year. On way to measure this volume is using design hourly volume --- the 30th highest hourly volume for the design year, usually 20 years from the end of the road's construction.

  • Survey the road for one year using a vehicle traffic counter to determine how many cars travel the road in total.

  • Divide the total number of cars by 365 to compute the average daily traffic, also called ADT.

  • Multiply the ADT by the percentage of the ADT that occurred during the design hour (the 30th highest-trafficked hour in the year 20 years after the end of construction).

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