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 PLATOONS, 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. /HSL/

• Supplemental Notes:
  • Rept No Rrl - LR -253, 43 PP, 10 REF
• Corporate Authors:

  Road Research Laboratory /UK

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

Subject/Index Terms

• TRT Terms: Digital computers; Information processing; Mathematical models; Networks; Optimization; Pretimed traffic signal controllers; Simulation; Traffic control; Traffic control devices; Traffic flow; Traffic signal timing; Traffic signals
• Old TRIS Terms: Traffic control systems
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00225914
• Record Type: Publication
• Source Agency: Highway Safety Literature
• Files: TRIS
• Created Date: Apr 10 1971 12:00AM