Incorporating Travel Time Reliability into the Highway Capacity Manual (2014) / Chapter Skim
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Pages 14-17
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14 C h a p t e r 2 Definitions for reliability Reliability is defined in engineering applications as "the probability that a component part, equipment, or system will satisfactorily perform its intended function under given circumstances." In statistics, reliability is defined as "the amount of credence placed in a result. The precision of a measurement, as measured by the variance of repeated measurements of the same object" (Parker 2003)
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15 For the L08 project, no attempt was made to isolate the effects of measurement error or prediction error from the reliability measurements or estimates. The separate effects of measurement uncertainty on the reliability data sets were not accounted for.
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16 considered to be a time mean speed) from a detector is assumed to be constant over a fixed distance (e.g., half the distance to the next upstream and downstream detectors)
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17 recommended its use. Furthermore, one of the more reliable past studies of reliability valuation used the difference between the 80th and 50th percentile travel times as the indicator of reliability.
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