Study Details
Study Title: Potential Driveway Density Accident Modification Factors for Rural Highways Using Texas Data
Authors: Fitzpatrick et al.
Publication Date:JAN, 2008
Abstract: The 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. For rural, two-lane highways, 2354 miles were available and 402 centerline miles were available for rural, four-lane highways evaluations. Based on a review of the data, it is recommended that the assumed base condition for driveway density be 3 driveways/mile. Negative binomial regression was used to determine the effects of independent variables on crashes. Crashes were examined in terms of driveway and segment crashes for three years (1999-2001). AMF equations that consider the driveway density for the segment were developed for both rural, two-lane and four-lane highways.
Study Citation: Fitzpatrick, K., E.S. Park, and W.H. Schneider IV. "Potential Driveway Density Accident Modification Factors for Rural Highways Using Texas Data." TRB 87th Annual Meeting Compendium of Papers CD-ROM. Washington, D.C., 2008.
CMFs Associated With This Study
Category: Access management
Countermeasure: Change driveway density from X to Y (driveways/mile for segment)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
 | |  | All | All | Principal Arterial Other | Rural |
| | | All | All | Principal Arterial Other | Rural |
