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TRB’s second Strategic Highway Research Program (SHRP 2) Report S2-L03-RR-1: Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies explores predictive relationships between highway improvements and travel time reliability. For example, how can the effect of an improvement on reliability be predicted; and alternatively, how can reliability be characterized as a function of highway, traffic, and operating conditions? The report presents two models that can be used to estimate or predict travel time reliability. The models have broad applicability to planning, programming, and systems management and operations.

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Errata

In February 2013 TRB issued the following errata for SHRP 2 Report S2-L03-RR-1: On page 80, the reference to Table 2.9 should be to Table 2.5. On page 214, the reference to Table B.30 should be to Table B.38. These references have been corrected in the online version of the report.

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Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2012. Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies. Washington, DC: The National Academies Press. https://doi.org/10.17226/22806.

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Publication Info

256 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/22806
Chapters skim
Front Matter i-viii
Executive Summary 1-13
Chapter 1 - Introduction 14-16
Chapter 2 - Preparatory Analyses 17-30
Chapter 3 - Data Collection, Assembly, and Fusion 31-49
Chapter 4 - Empirical Measurement of Reliability 50-79
Chapter 5 - Estimating Congestion by Source: The Cause of Congestion 80-120
Chapter 6 - Before-and-After Studies of Reliability Improvements 121-123
Chapter 7 - Cross-Sectional Statistical Analysis of Reliability 124-153
Chapter 8 - Application Guidelines 154-162
Chapter 9 - Conclusions and Recommendations 163-171
Appendix A - Data Elements and Structure for the Statistical Analysis Data Set 172-176
Appendix B - Before-and-After Analyses of Reliability Improvements 177-216
Appendix C - Computation of Influence Variables, Seattle Analysis: Mechanisms for Determining When an Incident Affects Travel Time and Travel Time Reliability 217-220
Appendix D - Seattle Analysis: Variable Definitions 221-228
Appendix E - Summary of Weather Data Tests: Seattle Analysis 229-244
Appendix F - Statistics Related to the End of Congestion: Seattle Analysis 245-249
Appendix G - Computation of Travel Time Metrics 250-252
Appendix H - Revised Data-Poor Equations 253-256
Reliability Technical Coordinating Committee 257-257
Related SHRP 2 Research 258-258

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