Analytical Procedures for Determining the Impacts of Reliability Mitigation Strategies (2012) / Chapter Skim
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Pages 250-252
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250 A p p e n d i x G introduction The key principle for constructing reliability metrics for use in Project L03 was that the metrics had to be based on the measurement of travel times over an appreciable amount of time and meaningful highway distances. Travel times are easily relatable to nontechnical audiences, and once measured they can be transformed into a wide variety of additional metrics.
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251 of the study was to measure congestion, not high speeds. If speeds were not capped, the resulting statistics would be biased because of the credit given to high speeds.
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252 Converting predicted TTi percentiles to Other Metrics TTI percentiles can be thought of as a ratio comparing the travel time for a given percentile with the travel time under free-flow conditions. For example, a 95th percentile TTI of 1.8 means that the 95th percentile travel time is 80% higher than the free-flow travel time.
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