Incorporating Reliability Performance Measures into the Transportation Planning and Programming Processes (2013) / Chapter Skim
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28 C h a p t e r 3 Incorporating reliability performance measures into the transportation planning and programming process requires an understanding of the state of the practice to ensure that the guidance will be useful to the transportation agencies and practitioners who will be responsible for the integration. A state of the practice survey was conducted in October and November 2010 to gather information about the identification of travel time reliability as an issue, the collection of travel time data, the calculation of reliability performance measures, and the challenges and issues agencies face in this area.
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29 survey) and 75% of midwestern and southwestern states responded.
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30 Tracking Reliability Performance Measures Many of the agencies that responded to the survey indicated that they are using performance measures, but only about 25% reported performance measures for tracking travel time reliability. Figure 3.3 presents the number of DOTs and MPOs that are tracking travel time reliability and other performance measures.
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31 Use of Reliability in Planning For recently completed or upcoming planning studies, survey respondents were asked if reliability was incorporated in the planning process. For a range of planning efforts, respondents were asked if they "include reliability as a goal or address as an issue," "identify reliability deficiencies or needs," and/or "use reliability results to help evaluate or prioritize projects." Findings by level of integration include the following: • Goal/issue.
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32 • Project prioritization. Agencies report using reliability to support project prioritization least frequently (38% across all planning products)
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33 Coordination Coordination with other agencies on transportation system operations or reliability issues is most common through ongoing committee and stakeholder outreach with transportation planning and operations staff at DOTs and MPOs. Respondents noted that transit agencies are commonly involved, nearly equally through stakeholder outreach, on going committees, or planning study committees.
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34 • Unrealized opportunities. Six large DOTs and 13 large MPOs are likely to have reliability problems (by virtue of population size)
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