Potential Accident Modification Factors for Driveway Density on Rural Highways Academic Article uri icon


  • Accident modification factors (AMFs) for driveway density can be described as the incremental effects of driveway density on safety. The objective of this study was to develop AMFs for driveways on rural highways in Texas. Available for evaluation were 2,354 mi of rural two-lane highways and 402 centerline miles of rural four-lane highways. From a review of the data, it is recommended that the assumed base condition for driveway density be three driveways per mile. Negative binomial regression was used to determine the effects of independent variables on crashes. Driveway and segment crashes for 3 years (1999 to 2001) were used in the evaluations. AMF equations that consider driveway density for the segment were developed for both rural two-lane and rural four-lane highways.

published proceedings

  • Transportation Research Record: Journal of the Transportation Research Board

author list (cited authors)

  • Fitzpatrick, K., Park, E. S., & Schneider, W. H

citation count

  • 4

complete list of authors

  • Fitzpatrick, Kay||Park, Eun Sug||Schneider, William H

publication date

  • January 2008