THE EFFECTS OF SIMPLIFYING TRAFFIC-ZONE AND STREET-NETWORK SYSTEMS ON THE ACCURACY OF TRAFFIC ASSIGNMENTS IN SMALL URBAN AREAS IN INDIANA

As a part of a detailed study of synthetic travel demand modelling techniques that can be applied to small urban areas (population 50,000 to 250,000), this study concentrated solely on the traffic assignment phase of the modelling process. The study considered the effects of the following factors on the accuracy of traffic assignment: number of traffic zones, use of census tracts as traffic zones, complexity of the network configuration and method of traffic assignment. Transportation network and travel data from two small Indiana urban areas, Lafayette and Anderson, were used. The results indicated that traffic zones, based upon census tract boundaries, and street networks with less detail, can be used without significant reduction in assignment accuracy. For the small urban areas considered in the study 90 internal zones can provide acceptable accuracy in traffic assignment.

  • Supplemental Notes:
    • See also PB80-217458 and PB80-217466. Sponsored in part by Indiana State Highway Commission, Indianapolis. Planning Study Title: Use of Synthetic Demand Modelling Techniques in Transportation Planning for Small Urban Areas in Indiana.
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284

    Indiana State Highway Commission

    Indianapolis, IN  USA  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  USA  20590
  • Authors:
    • Hanscom, E W
    • Sinha, K C
  • Publication Date: 1979-9-5

Media Info

  • Features: References;
  • Pagination: 85 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00326255
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: JHRP-79-15 Intrm Rpt., HS-030 227, FHWA/IN/JHRP-79/15
  • Contract Numbers: 1(17)-Pt1
  • Files: HSL, NTIS, TRIS, ATRI, USDOT
  • Created Date: Dec 11 1983 12:00AM