The aim of this project was to test bus priority at vehicle actuated traffic signals during normal service. The emphasis was on the detection system. The following methods of bus priority were tested: (a) interrupting the phase in progress in order to change to green in the bus direction. (b) prolonging green time in the bus direction and/or (C) connecting the bus phase twice per signal cycle. In this project so called amplitude selective detectors (long-loop detectors) were used for bus detection. This system comprises loop detectors laid in a certain way and equipment sensing the analog output voltage from the detectors. The system requires no equipment on the buses. The project showed that amplitude selective detectors are reliable for use in bus priority under similar conditions to those during the tests. Considerable time savings were obtained in junctions with a high volume of crossing traffic, where the green time for crossing traffic is dimensioned by vehicular traffic and in junctions with signal phase for buses, where the bus phase could be connected several times per cycle. Bus priority at separate pedestrian crossings and prolonging of green time in bus direction produces a small effect. /TRRL/

  • Corporate Authors:

    Swedish Board for Technical Development

    P.O. Box 43200
    S-100 72 Stockholm,   Sweden 
  • Publication Date: 1977


  • Swedish

Media Info

  • Features: Figures; Tables;
  • Pagination: 42 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00183381
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: STU-Report 76-3908 Monograph
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1978 12:00AM