ESTIMATING THE TRAFFIC CAPACITY OF A SIGNALIZED ROAD JUNCTION

A NEW METHOD OF ESTIMATING THE TRAFFIC CAPACITY OF A SIGNALIZED ROAD JUNCTION IS DESCRIBED. THE METHOD IS APPLICABLE TO A VERY WIDE RANGE OF JUNCTION LAYOUTS AND SIGNAL CYCLES AND IS SHOWN TO BE CONSISTENT WITH THE LESS WIDELY APPLICABLE METHOD WHICH IS STANDARD IN BRITAIN. THE RESULTS APPLY BOTH TO ISOLATED JUNCTIONS AND TO JUNCTIONS WHOSE SIGNAL FROM PART OF A LINKED SYSTEM. IN ESTIMATING THE CAPACITY OF A JUNCTION IT IS SUPPOSED THAT THE EXISTING ARRIVAL RATES OF TRAFFIC ON THE APPROACHES ARE ALL CHANGED BY THE SAME MULTIPLE, AND THE PRACTICAL CAPACITY OF THE JUNCTION IS REGARDED AS BEING ATTAINED WHEN THE MULTIPLE IS AS LARGE AS IS COMPATIBLE WITH SIGNAL SETTINGS, QUEUES AND DELAYS THAT ARE ACCEPTABLE TO THE ENGINEER. WHEN THE CAPACITY IS CALCULATED BY THE NEW METHOD THE CALCULATION YIELDS ALSO SIGNAL SETTINGS THAT MAXIMIZE CAPACITY AND QUANTITIES THAT ENABLE THE ENGINEER TO ESTIMATE HOW MUCH EXTRA CAPACITY COULD BE OBTAINED BY INCREASING THE MAXIMUM CYCLE TIME, REDUCING ANY GREEN TIMES THAT TAKE MINIMUM VALUES THAT HE HAS SPECIFIED, OR INCREASING THE SATURATION FLOWS OR ACCEPTABLE DEGREES OF SATURATION ON THE MOST HEAVILY LOADED APPROACHES. NUMERICAL EXAMPLES ARE GIVEN. /AUTHOR/

  • Authors:
    • ALLSOP, R E
  • Publication Date: 1972-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 245-55
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228503
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jun 5 1974 12:00AM