Incorporating Travel Time Reliability into the Highway Capacity Manual (2014) / Chapter Skim
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Pages 18-23
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18 C h a p t e r 3 Domestic and International agency Usage California The California Department of Transportation (Caltrans) has produced performance measures for the entire multimodal system (Downey 2000)
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19 SIS so that improvements can be prioritized on the basis of this measure and reported to decision makers. Additional information regarding this method is provided in a series of reports (Elefteriadou and Xu 2007; Elefteriadou et al.
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20 intervehicle variability (caused by personal driving styles and behavior of traffic signals along a certain route) (Bates et al.
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21 other parts of the world. The table also includes the skew statistic proposed by European researchers.
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22 1 to 2 hours) somewhere in the system.
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23 While various travel time percentiles historically have been used for the TTI, is the L08 team recommends that the 80th percentile highest travel time be used for the predicted travel time. The 80th percentile travel time has a more stable relationship to the mean travel time than the 90th, 95th, or 99th percentiles, so it is useful in predicting changes in reliability that are based on changes in the mean travel time.
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