THE USE OF THE TRRL TRANSYT METHOD

The paper describes trials, applications and extensions to the "transyt" method of calculating the best way of co-ordinating fixed-time traffic signals. Transyt consists of two parts: (1) a deterministic traffic model which is used to predict queuing behaviour; and (2) an optimising strategy which automatically searches for the best settings of the signals. Trials were carried out in London and Glasgow and independent evaluations have been made in several countries. In no case so far reported has any other control strategy been found to give an overall advantage over transyt. The computer program has been extended and it is now possible to model and minimise passenger, as opposed to vehicle, travel time. Used in this way, transyt finds fixed-time signal plans which give a measure of priority to buses (bus transyt). A stream of traffic which queues at A common stopline can be separated into up to 5 classes and the movement of these classes can be traced through A network. This facility is used in bus transyt and also to estimate the journey speed of vehicles which follow A particular route. The availability and other applications of the transyt method are described. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
• Corporate Authors:

  Printerhall Limited

  29 Newmart Street
  London W1P 3PE,   England 
• Authors:
  • ROBERTSON, D I
• Publication Date: 1975-12

Language

• English

Media Info

• Features: Appendices;
• Pagination: p. 562-563
• Serial:
  • Traffic Engineering & Control
  • Volume: 16
  • Issue Number: 12
  • Publisher: Hemming Group, Limited
  • ISSN: 0041-0683
  • Serial URL: http://www.tecmagazine.com/

Subject/Index Terms

• TRT Terms: Bus priority; Buses; Computer programs; Evaluation and assessment; Longitudinal joints; Mathematical models; Passengers; Pretimed traffic signal controllers; Queuing; Road markings; Speed; Stopping; Traffic control; Traffic signal preemption; Traffic signals; Travel time; Vehicle occupants
• Identifier Terms: FORTRAN (Computer program language)
• Uncontrolled Terms: Models; Stop lines
• Geographic Terms: United Kingdom
• ITRD Terms: 1272: Bus; 9020: Evaluation (assessment); 8616: Fortran; 648: Priority (traffic); 8645: Software; 654: Traffic control; 565: Traffic signal; 8119: United Kingdom; 1715: Vehicle occupant
• Subject Areas: Highways; Operations and Traffic Management; Passenger Transportation; Public Transportation; I71: Traffic Theory; I73: Traffic Control;

Filing Info

• Accession Number: 00138947
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Nov 17 1976 12:00AM