Guide to Establishing Monitoring Programs for Travel Time Reliability (2014) / Chapter Skim
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xiii 149 APPENDIX A Monitoring System Architecture 181 APPENDIX B Methodological Details 209 APPENDIX C Case Studies Case Study 1: San Diego, California Case Study 2: Northern Virginia Case Study 3: Sacramento–Lake Tahoe, California Case Study 4: Atlanta, Georgia Case Study 5: New York/New Jersey 499 APPENDIX D Use Case Analyses
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1This guide describes how to develop and use a travel time reliability monitoring system (TTRMS)
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2GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY • A 5-chapter guide that describes the process of measuring, characterizing, identifying, and understanding the effects of recurrent congestion and nonrecurrent events that affect travel time reliability. • Four appendices that provide more detailed information on the functional specifications of a monitoring system, methodological details, a series of case studies, and a series of use cases (applications)
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3GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY System operators want to determine how to reduce variability and enhance reliability; system users want to avoid variability. When making trips, system users want to select routes with reliable travel times, and they want to leave at the right moment so they can arrive on time or minimize the probability of being late.
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4GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY Third, the TTRMS needs to identify the sources of unreliability. Once the reliability of a segment or route has been characterized, transportation managers need to understand what caused the unreliability (and how to improve it)
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5GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY this guide, can tell an operator which of these activities is worth the investment and what the payoff will look like. Building this system will add a new, powerful, practical traffic management tool to the arsenal of system operators.
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6GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY AN ILLUSTRATION Figure ES.4 shows the travel times for a specific trip on a freeway (I-5 in San Diego, California) throughout a typical weekday, excluding any nonrecurrent events such as incidents, weather, unusual demand, or special events.
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7GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY Figure ES.4. Illustration of variation in travel times by time of day across a year with nonrecurrent events excluded.
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8GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY • Communicating to the public. The TTRMS can be used to communicate travel times or ranges of travel times to the traveling public and to passenger and freight movers, both pretrip and en route.
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9GUIDE TO ESTABLISHING MONITORING PROGRAMS FOR TRAVEL TIME RELIABILITY • Freight subsystem. Freight service suppliers (supply)
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