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Traffic Flow Improvements: Quantifying the Influential Regions and Long-Term Benefits
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2019-03-01
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[PDF-1.74 MB]
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Edition:Final Report May 2018 – March 2019
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Abstract:This research is to conduct a synthesis study on the full-scale effects of Traffic Flow Improvements (TFI) strategies in terms of the influential region and the changes of gains over time. The ultimate goal is to inform MassDOT’s evaluation of Congestion Mitigation and Air Quality (CMAQ) projects and their demonstrated benefits to relieve congestion and improve air quality. This synthesis consists of three main tasks: (1) a review of the commonly adopted TFI strategies and their impacts on traffic congestion mitigation and emission reduction; (2) a review of the methods for quantifying the effects of CMAQ TFI strategies; and (3) a survey of practitioners. It is found that most transportation agencies do consider the long-term impacts of TFI projects. Some agencies also take the regional impacts of a TFI project into account depending on its size and significance. However, very few agencies consider the induced demand impacts. The top two challenges for quantifying TFI benefits are: (1) lack of resources (e.g., funding, experienced staff, reliable data), well-accepted and documented tools/models, and consistent and widely-used evaluation standards; and (2) lack of project post evaluations. Based on the synthesis findings, both high-level and specific recommendations are provided.
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