Effectiveness of Different Approaches to Disseminating Traveler Information on Travel Time Reliability (2013) / Chapter Skim
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Pages 146-150
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146 C H a P T e r 1 2 The SHRP 2 Reliability program aims to improve trip time reliability by reducing the frequency and effects of events that cause travel times to fluctuate in an unpredictable manner. As the program planning document points out, congestion caused by unreliable, or nonrecurring, events is roughly as extensive as congestion caused by routine bottlenecks (Cambridge Systematics, Inc.
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147 79%) and had lower total late and early arrival penalties associated with the simulated trip ($38.61 versus $47.42 and $55.55 in the two control groups)
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148 Hypothesis 3 Hypothesis 3 stated that the benefits of reliability information would decline over time as both experimental and control subjects learned and understood the underlying travel time variability. That is, the benefit from reliability information during the first weeks would be larger than during the last weeks.
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149 Impact of Reliability Information on Broader Range of Travel-Related Choices The provision of reliability information may have benefits in other choices not studied in this experiment. These choices might include decisions on telework -- both the practical value of telework on a regular basis and dynamic telework decisions to remain at home rather than risk being en route at the time of a critical meeting (whether in-person or virtual)
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150 Combining Real-time and Reliability Information Feedback from the focus groups and computer survey indicated that travelers consider real-time travel time information to be a valuable and even necessary addition to historical data when planning trips. Research is needed to determine how best to combine real-time and historical travel time information to provide the most useful and accurate information to travelers.
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