A transit bus traffic signal priority system was evaluated on a 3.5 mile arterial corridor through the City of Concord, California. Twelve (12) signalized intersections were equipped with traffic signal preemption devices and 15 buses were equipped with emitters. In the operation of the system, in most cases as a bus approaches an intersection, the signal will hold an existing green phase or advance to a green phase. Average bus trip times were reduced by 10 percent with a resulting increase in schedule reliability. Bus delay was reduced 26 percent at the preempted signals and the number of stops decreased by 18 percent. All improvements were tested and found to be significant. Reduction in bus starting, stopping and waiting improves operating cast, saves fuel and lowers air and noise pollution. No increase in delay to passenger vehicles occurred to either the arterial corridor or the sidestreet traffic. This was possibly due to the light to moderate amount of bus traffic using the corridor. It is reasonable to assume that heavy bus usage would not result in the same favorable absence of increases to sidestreet delays. It can be concluded that the traffic signal priority system in effect on the arterial corridor in Concord has produced significant improvements in bus operation, without any observed adverse effects on traffic or on the environment. /Author/

  • Corporate Authors:

    TJKM Transportation Consultants

    710 South Broadway Suite 302
    Walnut Creek, CA  United States  94596
  • Publication Date: 1978-7

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 28 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00184850
  • Record Type: Publication
  • Source Agency: TJKM Transportation Consultants
  • Report/Paper Numbers: Final Rpt.
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM