PRIORITY OF PEDESTRIANS AND PUBLIC TRANSPORT BY COMPUTER CONTROLLED SIGNALIZATION
PRIORITERING AV FATGAENGARE OCH KOLLEKTIV TRAFIK GENOM DATASTYRD SIGNALREGLERING
Tests were made on computer control of traffic lights with the special aim of improving pedestrian and bus mobility without appreciably reducing mobility of other traffic. The tests compared relay-controlled central equipment using traffic-controlled programmes with computer controlled equipment. In relay control detectors at signal approaches report intensity, whereupon central equipment selects the appropriate programme. Some local control can also be incorporated. When signals are controlled by computer, the same programmes are used, but selection logic is different. Increased local control incorporating improvements for pedestrians was also tested. Tests were also made on giving priority to buses. The green period for pedestrians increased by 15-40% at some crossings, and bus waiting times during low traffic periods were cut by half. In the relay system the decision functions are located at the crossings, and the central control equipment has only a coordinatory function. This can lead to conflicting decisions. In computer control the local units are simple and only perform orders from the central equipment which receives information from detectors and optimises control over the whole area covered. In computer control the main costs lie in central equipment and cables, in relay control in the local control apparatus. /TRRL/
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Corporate Authors:
Stockholms Gatukontor
Utredningsavdelningen, Fack
Stockholm, Sweden - Publication Date: 1976
Language
- Swedish
Media Info
- Features: Figures;
- Pagination: 65 p.
Subject/Index Terms
- TRT Terms: Bus priority; Buses; Costs; Crosswalks; Digital computers; Equipment; Information processing; Optimization; Pedestrians; Public transit; Signalization; Strategic planning; Traffic signal preemption; Traffic signals
- Uncontrolled Terms: Optimum
- Subject Areas: Finance; Highways; Operations and Traffic Management; Pedestrians and Bicyclists; Public Transportation; I73: Traffic Control;
Filing Info
- Accession Number: 00147920
- Record Type: Publication
- Source Agency: Swedish National Road and Traffic Research Institute
- Report/Paper Numbers: Monograph
- Files: ITRD, TRIS
- Created Date: Aug 4 1981 12:00AM