Abstract
The primary goal of Strategic Highway Research Program 2 (SHRP 2) Reliability research is to improve the reliability of highway travel times by mitigating the effects of events that cause travel times to fluctuate unpredictably. A key component to addressing the reliability issue related to urban mobility is conveying reliability-related information to system users so that they can make informed decisions about their travel. The goal of the SHRP 2 L14 project, Effectiveness of Different Approaches to Disseminating Traveler Information on Travel Time Reliability, is to examine what combination of words, numbers, and other features of user information messages, along with communications methods and technology platforms, best communicate information about travel time and reliability to travelers so that they can make optimal travel choices from their point of view, such as whether to take a trip, departure time, mode choice, and route choice. This lexicon is one of the main L14 project work products. It offers recommendations to system operators on appropriate ways to provide travel time reliability information to travelers so that the information is most likely to be understood and used by travelers to influence their travel choices. On the basis of the results of human factors studies and current traffic engineering practices regarding communicating to drivers, recommendations were made in the lexicon for using the following terms related to travel time reliability: 95th percentile, arrival time, average travel time, buffer time, delay time, departure time, free-flow travel time, peak travel time, planning time, planning time index, recommended departure time, recommended route, and reliability. There is also input from a literature review, expert interviews, and a technology and innovation scan done as part of the research project. For each of the travel time reliability terms listed, the lexicon includes a technical travel time reliability term, the definition of the term or concept within the reliability framework, a description of when or for what purpose an agency might use the term, and recommendations for terminology, phrases, or graphics to be used, in order of preference. Finally, the lexicon identifies appropriate media and technology interfaces for each listed term, phrase, or graphic.
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Published on 01/01/2013
Volume 2013, 2013
DOI: 10.17226/22604
Licence: CC BY-NC-SA license
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