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What is Roadway Capacity?

Published
January 5, 2023

The maximum sustainable hourly flow rate at which vehicles reasonably can be expected to traverse a point or a lane on a roadway during a given time period, typically 15-minute intervals under prevailing roadway, traffic, and control conditions. It is expressed in vehicles per hour per lane.

Capacity is often expressed in vehicles per hour and calculated as:

nveh = 3600s / Tmin

Where nveh denotes the vehicles per hour and Tmin denotes the minimum safe headway, in seconds.