Operation of Traffic Signal Systems in Oversaturated Conditions, Volume 1: Practitioner Guidance

This guide presents a rational approach for identifying traffic control strategies for mitigating oversaturated conditions at signalized intersections. The guide discusses the following components of the rational approach:  diagnosis of the type and causes of the oversaturated condition; identification of appropriate operational objective(s) based on the observed condition(s); identification of appropriate strategies to address the situation; and identification of any necessary infrastructure, equipment, or software requirements for each strategy.  The intended audience for this guide is a practicing traffic engineer with responsibility for designing and implementing traffic signal system timing, phasing, sequencing, and scheduling. The guide focuses on common traffic control strategies and features available in the majority of traffic controllers.