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Traffic Congestion and Reliability: Making the Connection with Operations. Part 1: Measuring and Tracking Reliability

One focus of the Federal Highway Administration's Mobility Monitoring Program (MMP) has been to develop reliability measures that look at travel times and the effects of various causes of congestion. This paper reports on the background of MMP's efforts to monitor congestion and reliability and lessons learned from this attempt. Although providing reliable travel times is a major part of what customers want from the highway system, multiple factors can cause travel times to become unreliable and averages can be deceiving when considering travel time reliability. The MMP research also has found that base congestion level and travel time reliability are intertwined. Part 2 of this series will focus on operational approaches to improving reliability and mitigating congestion.