This study summarized and evaluated information on characteristics of collector-distributor roads as used at interchanges to permit wiser design and use of such facilities. A review of state design standards and policies and review of the literature was made. A study was made of the operation and accidents at four interchanges equipped with C-D roads and three interchanges without C-D roads in Indiana. The results showed agreement among design experts favoring C-D road use as a design ideal to minimize weaving, improve operation, and generally to improve design. Analysis of accident rates for 100 million vehicles by total number and by type showed only weaving-type accidents to be significantly different, with C-D sites experiencing fewer accidents than non-C-D sites. Construction costs were higher for C-D interchanges, as were maintenance costs. Operating costs were not different at low volumes, yet based on assumptions of probable higher volume operating conditions, the C-D interchange would have lower operating costs.

  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Hansell, R S
  • Publication Date: 1975-2

Media Info

  • Pagination: 135 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00097877
  • Record Type: Publication
  • Report/Paper Numbers: JHRP-75-1
  • Files: TRIS
  • Created Date: Aug 27 1975 12:00AM