TRANSYT: A TRAFFIC NETWORK STUDY TOOL

TRANSYT IS A METHOD OF DETERMINING OPTIMUM FIXED-TIME TRAFFIC SIGNAL SETTINGS THAT ENABLE KNOWN FLOWS TO PASS THROUGH A ROAD NETWORK WITH MINIMUM IMPEDANCE. THE METHOD IS IMPLEMENTED BY A DIGITAL COMPUTER PROGRAM. A TRAFFIC MODEL IS USED IN WHICH ALLOWANCE IS MADE FOR THE FLOW INTERACTION BETWEEN SUCCESSIVE ROAD SECTIONS, FOR THE DISPERSION OF PLATTONS AND FOR FLOW CONTROL BY SIGNALS OR ANOTHER TRAFFIC STREAM WHICH HAS RIGHT OF WAY. THE METHOD OF CALCULATION GIVES A SHORT SOLUTION TIME. GOOD CONVERGENCY ON THE OPTIMUM SIGNAL SETTINGS IS ACHIEVED BY USING A HILL- CLIMBING TYPE OF OPTIMIZATION PROCEDURE THAT MINIMIZES ANY CHOSEN BALANCE BETWEEN TOTAL DELAY AND THE NUMBER OF STOPS. BOTH THE SIGNAL OFFSETS AND THE ALLOCATION OF THE GREEN TIMES CAN BE OPTIMIZED. NETWORKS CAN HAVE UP TO 50 INTERSECTIONS WITH NO RESTRICTION ON THE LAYOUT OF THE ROADS. /RRL/A/

• Supplemental Notes:
  • Rrl Bpt Lr 253, 37 PP, 14 FIG, 3 TAB, 10 BEF
• Corporate Authors:

  Road Research Laboratory /UK

  ,    
• Authors:
  • ROBERTSON, D I
• Publication Date: 1969

Subject/Index Terms

• TRT Terms: Digital computers; Green interval (Traffic signal cycle); Intersections; Mathematical models; Networks; Optimization; Pretimed traffic signal controllers; Traffic control; Traffic delays; Traffic flow; Traffic platooning
• Uncontrolled Terms: Models
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225305
• Record Type: Publication
• Source Agency: Road Research Laboratory /UK
• Files: TRIS
• Created Date: May 19 1970 12:00AM