Travel time reliability takes a holistic approach to the evaluation of systems and/or corridor performance by considering both recurring and non-recurring congestion and delay. Reoccurring congestion refers to predictable traffic congestion that is routinely associated with commuter peak periods with no additional influences. Non-reoccurring congestion refers to more unpredictable traffic congestion typically influenced by weather, construction, crashes/incidents, and events.

Why Does it matter?

By incorporating travel time reliability concepts and methodologies, agencies can evaluate more subtle roadway features such as dynamic shoulders, ITS installations, tolling lanes, service patrols and maintenance activities. As a performance measure, travel time reliability can be expressed many different ways, from singular travel time indices to multi-dimensional charts/graphics and everything in between. Combined with capital and maintenance costs, travel time reliability benefits can be used for economic analysis alternatives, such as benefit cost, net present value, and life cycle analysis. SRF posses the experience and expertise to conduct all analysis regarding Travel Time Reliability.