Selecting Travel Reliability Measures (TTI-2003-3)

This report discusses the background for developing reliability measures as a component of mobility performance metrics, the factors to consider before selecting a measure and defines the calculation procedures for typical reliability analyses. This might involve a change in thinking about how mobility service is conceptualized and communicated. The terms "recurring" and "non-recurring" congestion are misnomers-variations in weather, traffic volume and a range of other factors can be termed "recurring" but have traditionally been included outside the "regular" congestion label.