Overview of Congestion Measurement Principles

摘要

The key to measuring congestion is using travel time and speed measures. They satisfy the widest range of requirements for congestio ninformation. The determination of unacceptable congestion levels is a function of both technical factors and public input. Acceptable travel time and travel rate measures are important concepts that translate the expectations that citizens have for the transportation system into factors that can be used to prioritze transportation system improvements. Other measures such as delay rate, relative delay rate and total delay are useful as measures of the performance of system elements. Combining travel time and person movement will provide a basis for evaluating individual modes and multimodal transportation system.