The application of traffic signal preemption systems for controlling bus headways
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The application of traffic signal preemption systems for controlling bus headways

Filetype[PDF-1.60 MB]


  • English

  • Details:

    • Creators:
    • Publication/ Report Number:
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    • Edition:
      Project memorandum
    • NTL Classification:
      NTL-SAFETY AND SECURITY-SAFETY AND SECURITY ; NTL-SAFETY AND SECURITY-Human Factors ;
    • Abstract:
      This report investigates the application of selective traffic signal preemption

      for controlling the headways of local service buses (buses with average time

      headways of less than 10 minutes), The preemption is selective in that it is granted

      to only "late" buses along a route, leading to a reduction in headway variance. The potential benefits of more evenly spaced bus headways include reduced passenger

      waiting times, reduced incidence of bus over loadings and more efficient fleet operation. Past application of traffic signal preemption systems have concentrated on

      reducing travel times for buses in Central Business District (CBD) grids and arterials.

      However, these systems have not been widely accepted and implemented,

      indicating that the amount of reduction in travel time has not resulted in a sufficient

      increase in ridership to offset the system costs and impacts on other traffic.

      The analysis and simulation results in this report indicated that selective

      traffic s1gual preemption is a feasible method for controlling the headways of buses

      on short headway routes. Furthermore, selective preemp-ifon yielded equal or better

      transit system performance compared to unconditional preemption with less than half

      as many preemptions and preempted cycle time. Future plans are discussed for expandinr,

      the simulation model developed in this report and continuing the analysis.

      The output of this work is expected to be a quantification of benefits as a function

      of bus priority variables, traffic variables and route characteristics.

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