May 02 Daily Question: Headway and Hourly Volume on a Two-Lane Road

NCEES Civil PE Specification VI.C.: Traffic Volume


The pictured two-lane roadway is congested in the direction of Lane A every evening during rush hour. A study was conducted, and Lane A was found to have a peak hour factor of 0.75 and a peak rate of flow of 150 vehicles per 15 minutes. Given that Lane B has an hourly volume during rush hour equal to one-third the volume of Lane A, determine the average vehicle headway anticipated for Lane B during rush hour in seconds per vehicle.

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