Details:

Creators:
Strathman, James G. ; Kimpel, Thomas J. ; Leistner, Paul
Strathman, James G. ; Kimpel, Thomas J. ; Leistner, Paul Less -
Corporate Creators:
Portland State University. Center for Urban Studies
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Driver Licenses Drivers' Licenses--Oregon Point Demerit Systems Point System (Traffic Violations)--Oregon Traffic Accidents--Oregon Traffic Crashes
Publication/ Report Number:
FHWA-OR-RD-07-08
Resource Type:
Tech Report
Geographical Coverage:
Oregon
Edition:
Final report.
Corporate Publisher:
Oregon. Dept. of Transportation. Research Unit
Abstract:
This report provides an evaluation of the Oregon Department of Transportation-Driver and Motor Vehicle

(DMV) Services Driver Improvement Program (DIP), which was substantially changed in 2002. Prior to 2002,

the DIP was organized around four progressive steps involving advisory letters, warning letters, probation, and

suspension. The current program is organized around two steps: restriction and suspension. The timeline to

the steps in the current program have also been shortened. To evaluate the current program, driver records of

persons suspended between January and July of 2004 were examined in relation to a sample of Oregon’s

driving population. The incidence of crashes and traffic offense convictions of DIP subjects in the 18-month

period prior to suspension was compared to the incidence of these events among the driving population. A

similar comparison was also made for the 18-month period following suspension. A substantial reduction in

the relative incidence of crashes and convictions among DIP subjects following suspension was observed.

This finding is subject to the effects of regression-to-the-mean. An approximation of regression-to-the-mean

effects was made based on prior evaluations of Oregon’s DIP that employed a true experimental design. A

regression analysis was also undertaken using driver record information from the period prior to suspension to

estimate the likelihood of post-suspension crash and traffic offense conviction involvement. The estimated

likelihood of post-suspension crash involvement was significantly affected by the frequency of pre-suspension

crashes, but not by the frequency of pre-suspension convictions. Conversely, the estimated likelihood of postsuspension

convictions was significantly affected by the frequency of pre-suspension convictions, but not by

the frequency of pre-suspension crashes. Two changes in the DIP are suggested in the concluding section of

the report. The first change involves re-instituting warning letters, given their demonstrated cost effectiveness

in the driver improvement literature. The second change involves the assignment of greater weight to crashes

in triggering license actions, based on the regression findings.


Format:
PDF
Funding:
SPR 634
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:48b6ad66c83113cfdd3b24ec9928ff0f73de705f5b606fb75960833d67c5e3e0
Download URL:
https://rosap.ntl.bts.gov/view/dot/21848/dot_21848_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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