DUII control system performance measures for Oregon counties 1991-2001

NHTSA · 2002 · ROSA P / Oregon. Dept. of Transportation

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Summary

This report, published by the Oregon Department of Transportation’s Transportation Safety Division in August 2002, presents performance measures for the state’s Driving Under the Influence of Intoxicants (DUII) control system from 1991 to 2001. The document addresses the complex social problem of impaired driving, which accounts for nearly half of fatal and serious injury crashes in Oregon. Its primary objective is to provide local jurisdictions and agencies with comparative data to assess the severity of DUII-related problems, identify system deficiencies, and target specific countermeasure efforts. The report compiles data from various state agency sources, organizing it into seven key system areas: crashes, enforcement activity, implied consent suspensions, diversion programs, DUII convictions, additional court activity, and youth under 21 years of age. The data is presented at both the state level and for each of Oregon’s 36 counties. The methodology involves aggregating statistics on population characteristics, vehicle miles traveled, crash frequencies, offense counts, arrest rates, breath test refusals, diversion agreements, conviction types, and treatment enrollments. The report advises users to employ statistical techniques, such as normalizing data for population size and performing chi-square analysis, to determine if differences between counties or over time are significant. It also notes that data comparability may vary due to different sources or reporting periods. Key findings for the state of Oregon between 1991 and 2001 indicate a general decline in DUII-related incidents despite a 15.6% population increase. Fatal and injury crashes decreased from a peak of 25,024 in 1996 to 18,422 in 2001, with the crash rate per million vehicle miles traveled dropping from 0.79 to 0.54. The percentage of fatalities determined to be alcohol-related fell from 47.7% to 35.5%. Total DUII offenses decreased by 13.8%, from 29,108 to 25,097, and DUII convictions dropped from 12,905 to 10,046. Breath test refusals declined significantly from 5,438 to 3,257. However, DUII arrests for drugs other than alcohol increased substantially from 101 to 933, attributed partly to the Drug Recognition Expert Program. Treatment enrollments for convicted offenders rose from 8,550 to 9,023, with 98.1% of 2001 enrollments in rehabilitation programs. Youth fatalities under 21 decreased slightly from 104 to 100, though alcohol-related youth fatalities remained at 22 in 2001. Minor in Possession citations increased from 12,721 to 14,069. The significance of this report lies in its utility for traffic safety planning and policy evaluation. By providing granular, county-level data alongside state trends, it enables local officials to benchmark their performance, identify specific problem areas such as nighttime crashes or diversion program efficacy, and justify support for targeted traffic safety programs. The data highlights the effectiveness of certain enforcement and treatment strategies while pointing to emerging issues like drug-impaired driving, informing future countermeasure development.

Key finding

Alcohol-related fatalities decreased from 47.7% of all fatalities in 1991 to 35.5% in 2001, while arrests for drugs other than alcohol increased from 101 to 933 during the same period.

Methodology

dataset

Provenance

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• dui enforcement