Establishing Monitoring Programs for Travel Time Reliability

TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-L02-RR-1: Establishing Monitoring Programs for Travel Time Reliability describes what reliability is and how it can be measured and analyzed.

SHRP Reliability Project L02 has also produced Guide to Establishing Monitoring Programs for Travel Time Reliability that describes how to develop and use a Travel Time Reliability Monitoring System (TTRMS), and Handbook for Communicating Travel Time Reliability Through Graphics and Tables that offers ideas on how to communicate reliability information in graphical and tabular form.

A related paper in TRB’s Transportation Research Record, “Synthesizing Route Travel Time Distributions from Segment Travel Time Distributions,” examines a way to synthesize route travel time probability density functions (PDFs) on the basis of segment-level PDFs in Sacramento, California.

​Errata: The title page originally did not include all authors' names, and Figure 2.3 on page 18 and the date given on pages 16 and 108 for the Figure 2.3 website visit were incorrect. The title page and pages 16, 18, and 108 have been corrected in the online version of the report. (October 2014)