Establishing Monitoring Programs for Travel Time Reliability (2014) / Chapter Skim
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1Within the second Strategic Highway Research Program (SHRP 2) , Project L02 focused on creating a suite of methods by which transportation agencies could monitor and evaluate travel time reliability.
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2The Guide includes an executive summary, which gives agency managers a description of what a TTRMS is, why it is valuable, and how it can be used; and five chapters that describe the monitoring system: • Chapter 1 (Introduction) provides an overview of travel time reliability.
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3 a given operating condition every time that condition arises. Figure ES.2 shows average travel times on workdays during 2011 for a route on I-5 in San Diego, California.
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40% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 40 50 60 70 80 90 100 110 120 130 140 Cu m ul ati ve Pr ob ab ili ty Travel Rate (sec/mi) Weather High Incident High Special Events Mod Incident Mod Weather Low Weather Mod Demand High DemandMod Normal Low Normal Uncongested Normal High Figure ES.3.
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5 First, the monitoring system needs to measure travel times. This is a complex technical task due to the variability of traveler behavior and the plethora of types of measurement sensors.
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