Investigation of the Factors that Affect Travel Time Reliability

With the Moving Ahead for Progress in the 21st Century Act (MAP-21) System Performance Measure requirements, state DOTs are responsible for not only reporting travel time reliability but also for setting targets and showing progress towards those targets. In order to know how to improve travel time reliability and what to expect from the investments in transportation infrastructure, state DOTs need a better understanding of the factors that affect travel time reliability. This project aims to identify the factors influencing travel time reliability, quantify their impacts, and investigate how to account for these factors in setting VDOT’s reliability targets and communicating progress. This project will also identify potential countermeasures that can be used to improve travel time reliability.