Transit Signal Priority: Current State of the Practice (2020) / Chapter Skim
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Pages 68-72
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From page 68... ...
68 C H A P T E R 5 This study sought to provide an up-to-date review of the current state of bus TSP deployments in North America to help professionals better understand benefits, challenges, and lessons learned regarding bus TSP, and to identify notable practices on the part of transit agencies that might contribute to successful TSP implementations and effective TSP operations and optimization. The results of the literature review, survey, and case examples provide useful information about bus TSP and TSP deployments in North America, including their architectures, business rules, and parameters, as well as performance monitoring and operations and maintenance.
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From page 69... ...
Conclusions and Further Research 69 – More than half of the deployments allowed buses to request priority at intersections with near-side bus stops either before or after leaving the stop. Business rules and parameters for buses that requested priority before leaving the stop had to take into account the anticipated dwell time at the stop.
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From page 70... ...
70 Transit Signal Priority: Current State of the Practice • TSP Benefits – Surveyed transit agencies found TSP to be generally effective at achieving desired outcomes -- especially in reducing intersection delay, reducing travel times, and improving schedule adherence. Improving headway adherence and reducing headway variability were rated as the lowest benefit, but this may be attributable to the fact that most survey respondents implemented TSP to improve schedule adherence, not headway adherence.
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From page 71... ...
Conclusions and Further Research 71 effectiveness of TSP will be frustrated by the relative lack of standardized, empirical information. More research is needed to better define the types of benefits from TSP, standardize measurement approaches to quantifying different benefit types, and actually calculate benefits from different deployments that sought to achieve specific benefits using relevant business rules and parameters.
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From page 72... ...
72 Transit Signal Priority: Current State of the Practice to better align coordinated and even adaptive signaling systems with TSP need more investigation to fully understand their potential benefits and challenges. • Best Practices for TSP Operations, Maintenance, and Optimization The transit industry needs more guidance on best practices for operating, maintaining, and optimizing TSP systems after implementation.
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