Practical reserve capacity
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In traffic engineering, the practical reserve capacity (PRC) of a traffic signal junction is a commonly used measure of its available spare capacity.
The practical reserve capacity is related to the degree of saturation of a traffic signal junction. A positive PRC indicates that a junction has spare capacity and may be able to accept more traffic. A negative PRC indicates that the junction is over capacity and is suffering from traffic congestion.
A PRC value is calculated by the commonly used traffic signal modelling software LINSIG.
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