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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)

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2014. Establishing Monitoring Programs for Travel Time Reliability. Washington, DC: The National Academies Press. https://doi.org/10.17226/22612.

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Publication Info

109 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/22612
Chapters skim
Front Matter i-viii
Executive Summary 1-5
Chapter 1 - Introduction 6-11
Chapter 2 - Survey of Existing Systems and User Needs 12-36
Chapter 3 - Functional Specifications 37-44
Chapter 4 - Data Collection, Assembly, and Cleaning 45-50
Chapter 5 - Sensor Spacing and Sampling for Travel Time Reliability Monitoring 51-61
Chapter 6 - Data Processing and Analysis 62-87
Chapter 7 - Case Studies 88-101
Chapter 8 - Summary and Conclusions 102-104
References 105-109
Reliability Technical Coordinating Committee 110-110
Related SHRP 2 Research 111-111

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