Estimating the Impacts of Transit Service on Roadway Congestion

The Texas A&M Transportation Institute’s (TTI’s) Urban Mobility Report (UMR) provides transportation decision-makers with urban-area congestion statistics and trends. Data and their availability have continued to evolve rapidly over the years that this report has been produced, and TTI researchers have updated the UMR methodology as new data sources and information become available. This NCTR project was the public transportation part of TTI’s “Investigation of Improvements to Truck Volume Assignments and Public Transportation Methodologies in TTI’s Urban Mobility Report” project. Specifically, the team investigated the UMR methodology related to the benefits of transit ridership and transit delay reduction calculations and possible methodology improvements. NCTR public transit experts collaborated with TTI provide several proposed methodological improvements to the transit benefits methodology for the 2013 UMR, including (a) explicitly accounting for the miles traveled by roadway-based transit vehicles operating in mixed traffic conditions, and (b) more accurately accounting for the potential shift to private passenger vehicles in a post-transit environment by transit riders for the passenger miles they have actually traveled by transit. The results  can be found in Chapter 4 in the TTI final report.  It also documents future improvement opportunities for the short term and long term.  Download TTI’s final report.

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