EFFECT OF ZONE SIZE ON TRAFFIC ASSIGNMENT AND TRIP DISTRIBUTION

THE ANALYSIS IN THIS PAPER OF THE EFFECT OF ZONE SIZE ON TRAFFIC ASSIGNMENT AND TRIP DISTRIBUTION WAS BASED ON THE RESULTS OF A RESEARCH STUDY INITIATED BY THE AUSTRALIAN COMMONWEALTH BUREAU OF ROADS. THIS INVESTIGATION WAS CONCERNED WITH IDENTIFYING CRITERIA FOR ZONE SIZE SELECTION, BASED ON THE RESULTS OF APPLYING STANDARD TRIP DISTRIBUTION AND TRAFFIC ASSIGNMENT PROCEDUES TO AN ACTUAL ROAD NETWORK AND VEHICLE TRIP MATRIX. VEHICLE TRIPS WERE AGGREGATED TO 5 TEST SYSTEMS, RANGING FROM 40 TO 263 ZONES, AND ASSIGNMENTS WERE MADE TO THE BASIC 1964 ROAD NETWORK. THE EFFECT OF DIFFERENT ZONE SYSTEMS ON TRAFFIC ASSIGNEMENT WAS EVALUATED STATISTICALLY BY COMPARING ASSIGNMENTS WITH THOSE FOR THE STUDY AREA'S 607-ZONE TRIP MATRIX AND WITH 1964 TRAFFIC COUNTS AT 16 CHECK LINES LOCATED THROUGHOUT THE STUDY AREA. THE EFFECT OF ZONAL AGGREGATION ON THE SIMULATION OF TRIP DISTRIBUTIONS WAS ALSO TESTED, BOTH FOR A1-PURPOSE AND A 4-PURPOSE DISTRIBUTION. DISTRIBUTION ERRORS ATTRIBUTABLE TO THE AGGREGATION OF ZONES AND TO THE GROUPING OF TRIP PURPOSES WERE EVALUATED FOR 3 ZONE PLANS BY COMPARING ASSIGNMENTS OF THE RESULTING TRIP MATRICES WITH THE 607-ZONE SYSTEM ASSIGNMENT AND WITH THE 1964 CHECK-LINE VOLUMES. IT IS CONCLUDED THAT FOR MANY ASPECTS OF TRANSPORT PLANNING, ZONE PLANS WITH AN AVERAGE OF 30,000 TRIP ENDS PER ZONE WILL YIELD TRAFFIC ASSIGNMENTS SUFFICIENTLY ACCURATE FOR PREDICTIONS OF TRAFFIC GROWTH WITHIN TRANSPORTATION CORRIDORS. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; Tables;
  • Pagination: pp 58-75
  • Monograph Title: Transportation demand and analysis techniques
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00228218
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Feb 23 1973 12:00AM