Effectiveness of Different Approaches to Disseminating Traveler Information on Travel Time Reliability (2013) / Chapter Skim
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1The second Strategic Highway Research Program (SHRP 2) Reliability program aims to improve trip time reliability by reducing the frequency and effects of events that cause travel times to fluctuate unpredictably.
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2they would be in a time-pressured situation immediately before departure or actually en route in the vehicle. Thus, message content and display -- that is, the optimal display, sequence of inputs required, and display of search results -- were the main focus of this project.
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3 Reliability Terminology: Human Factors Experiments This project developed the Lexicon for Conveying Travel Time Reliability Informations to provide information on appropriate ways to introduce and provide travel time reliability information to travelers so that such information will most likely be understood and used by the travelers to influence their travel choices, while not presenting a safety hazard in the process. The lexicon was developed on the basis of an increasingly detailed series of human factors experiments and the development of a utility function, with input from a literature review, expert interviews, and a technology and innovation scan.
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4mean "most of the time (15 days out of 20) ." Other terms tested for this concept (typical, historical, estimated)
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5 platforms for which each variant of a term is appropriate. Chapter 11 of this report includes the lexicon -- as Tables 11.3 through 11.10 -- and contains recommendations for terms describing the concepts of 95th percentile trip time, arrival time, average travel time, buffer time, departure time, recommended departure time, recommended route, and reliability.
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6to day but instead reflected the historical reliability of travel along a route. In addition to differing levels of reliability information, all participants received pre-trip and en route advisory messages via simulated dynamic message signs as well as text-format "radio messages." In both experiments, participants selected a departure time on the basis of pre-trip information, experienced travel time as a function of trip duration, and rated the value of the information simulated from day to day.
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7 compared with both an experimental group that receives reliability information but no contextual information and a control group that receives no reliability information. Hypothesis 2b was not supported by the enhanced laboratory study.
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8• Changing effects and value of reliability information for travelers on familiar routes; • Effects of reliability information on travel-related choices such as home and work locations, facility locations for businesses, and others; • Use of reliability information by the freight industry; • Effects of reliability information in public transit; • Traveler responses to increased travel time reliability; • Further examination of graphical formats for reliability information; and • Field tests of reliability terminology.
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