Synthesis of Information Related to Transit Practices. Topic SA-47. Transit Signal Priority – Current State of the Practice

Transit signal priority (TSP) is an important tool that increases bus speeds, and both improves customers' travel times and operators' cost efficiency. Transit agencies report widely varying levels of benefits from TSP implementations, however. This synthesis study aims to document the current practice of transit systems as it related to the use of TSP. Currently, only fragmented documentation exists on the TSP parameters in place at different agencies and there has not been a systematic effort to understand the link between TSP parameters and the level of benefit realized. The result is an absence of established practices or industry standards informing decision-making with substantial stakes in determining the benefits realized from expensive investments in TSP technology. As agencies have limited understanding of what parameters are in use in other jurisdictions and how these decisions tie to the benefits of TSP, it is difficult to clearly weigh the benefits against the tradeoffs involved. The goal of this study is to provide an overview of the current state of practice regarding the implementation and practice of using TSP (i.e., planning, service, operations and maintenance). The product of this research will be a synthesis report documenting the TSP parameters in place at transit agencies with significant TSP programs, the bus run time benefits linked to TSP, and an assessment of to what extent the disparity in run time benefits realized are driven by parameter choices. Information will be gathered by a literature review (e.g. agency reports, peer reviewed journal articles) and a survey of selected transit systems that utilize TSP. Topics to be studied include research and practice on the following items (not an inclusive list): (1) Planning: Should include variety of parameters that apply where TSP is used (distance from intersection, wait time, layover time, bus priority at some intersection vs. others, etc.) and reasons behind the decision; (2) Service, Maintenance and Operations; (3) Costs and benefits (What benefits at what costs?). The report should also include 4-5 case examples that will gather information on the state-of-the-practice, emphasizing lessons learned, current practices, challenges, and gaps.


  • English


  • Status: Proposed
  • Funding: $45000
  • Contract Numbers:

    Project J-07, Topic SA-47

  • Sponsor Organizations:

    Transit Cooperative Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001

    Federal Transit Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Garcia-Colberg, Mariela

  • Start Date: 20180820
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01673589
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project J-07, Topic SA-47
  • Files: TRB, RiP
  • Created Date: Jun 25 2018 3:03PM