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1. Report No.
HS 809 707
Government Accession No.
Recipients Catalog No.
4. Title and Subtitle
Aggressive Driving Enforcement:
Evaluation of Two Demonstration Programs
5. Report Date
Performing Organization Code
Jack Stuster, PhD, CPE
Performing Organization Report No.
9. Performing Organization Name and Address
P.O. Box 519 11. Contract No.
Santa Barbara, CA 93102
Work Unit No. (TRAIS)
Contract or Grant No.
12. Sponsoring Agency Name and Address
Highway Traffic Safety Administration
400 Seventh Sreet, SW
13. Type of Report and Period Covered
Sponsoring Agency Code
Ellison-Potter, PhD, was the Contracting Officer’s
Representative (COTR) for this project.
presents the results of a study conducted for the National
Highway Traffic Safety Administration (NHTSA) to assess
the effects of two programs that were implemented to reduce
the incidence of aggressive driving. The programs were conducted
by the Marion County Traffic Safety Partnership (a consortium
of agencies in the vicinity of Indianapolis, Indiana), and
The Tucson, Arizona, Police Department. The programs each
received grants of $200,000 from NHTSA to support the special
enforcement and public information and education (PI&E)
components. Program managers were required, as conditions
of the grant, to 1) focus their enforcement efforts on key
aggressive driving infractions in carefully-selected zones
within their communities; 2) develop and implement PI&E
campaigns to publicize the special enforcement efforts;
and, 3) provide the data and other information necessary
to prepare this evaluation. The programs shared additional
features, but program managers were encouraged to consider
innovative approaches to both special enforcement and publicity.
Samples of vehicle speed, collected unobtrusively in the
special enforcement zones, and crash incidence served as
the primary measures of program effect. Average speeds slightly
in Marion County and at a greater rate in Tucson. The total
number of crashes in the Marion County special enforcement
zones increased by 32 percent, compared to the same six-month
period one year earlier; the number of those crashes with
primary collision factors (PCFs) associated with aggressive
driving increased by 41 percent. That is, the total number
of crashes increased, but the crashes with aggressive driving
PCFs increased at a greater rate. The change in proportion
of crashes with the target PCFs provides a better measure
than crash frequency because it eliminates the effects of
changes in traffic volume and other factors that might have
contributed to the overall increase in crash incidence.
In this regard, the Marion County zones experienced a six
percent increase in the proportion of all crashes with aggressive
driving PCFs, despite the extensive publicity and special
enforcement efforts. The number of crashes in Tucson’s
special enforcement zones increased by ten percent, but
the number of crashes with aggressive driving PCFs increased
by less than one percent. More important, the proportion
of all crashes with target PCFs decreased by eight percent.
That is, crash incidence increased overall in Tucson’s
zones, but the proportion of those crashes with aggressive
driving PCFs declined.
Study results suggest that limited resources might be better
spent on officer labor than on publicity, and that focusing
enforcement responsibility on a small team assigned full-time
to the special enforcement patrols might be more effective
than sharing the responsibility among a large number of
officers as occasional overtime duty.
17. Key Words
Safety, Aggressive Driving, Road Rage
18. Distribution Statement
Document is available
to the public through the National
Technical Information Service, Springfield, Virginia 22161
19. Security Classif. (Of this report)
20. Security Classif. (Of this page)
21. No. of Pages
DOT F 1700.7
of completed page authorized