Cross-Section Design, Operational, Access, and Safety Relationships On Urban Multilane Roadways

This study examined relationships between crash rates and certain cross-section design, operational, and access attributes. The scope included all urban multilane roadways on the Arkansas state highway network, excluding fully controlled-access roadways (i.e., freeways). The methodology reflected a concern for the potential effects of the uneven distribution of certain attributes among the median types. Negative binomial regressions indicated that the crash rates increased when the traffic volume increased, the number of traffic signals per mile increased, the access density increased, or the commercial-and-industrial access density increased. Also, a multiple-factor model that included volume, access density, and median type was developed, although median type was not a statistically significant variable. The differences between two crash prediction models, one fit over the entire range of data and the other over a smaller but better populated subset, indicates that models that compare the crash rates of alternative cross-sections can be affected by the uneven distribution of the variables across the alternative treatments. This suggests that data distribution should be critiqued before proceeding with model development.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References;
  • Pagination: 20p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01047603
  • Record Type: Publication
  • Report/Paper Numbers: 07-2936
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:39PM