News Release

Oregon study: Consequences of driving drunk are paying off

Lowering the legal threshold and increasing punishments would make drivers think harder about taking the wheel after drinking, says UO economist

Peer-Reviewed Publication

University of Oregon

Benjamin Hansen, University of Oregon

image: Benjamin Hansen, an economist at the University of Oregon, has found that punishments aimed at alcohol intoxicated drivers are working, but suggests that lowering legal thresholds and increasing levels of punishments would make drivers think more seriously about drinking and driving. view more 

Credit: University of Oregon

EUGENE, Ore. -- (April 6, 2015) -- Punishments for drivers whose blood alcohol content is measured above legal thresholds for impairment have reduced the likelihood of repeat offenses, says a University of Oregon economist.

His study of data gathered from 1999 to 2011 in the state of Washington -- where a BAC over .08 is considered to be driving under the influence -- found a 17 percent reduction in recidivism. An additional 9 percent reduction was seen in cases involving blood alcohol content above .15, which constitutes an aggravated intoxication threshold.

BAC is the concentration of alcohol within a person's blood stream. It refers to how much alcohol is present in 100 milliliters of blood.

The findings by Benjamin Hansen, who studies policy implications of risky behaviors such as marijuana and alcohol use, are in the April issue of American Economic Review. The publication is among the nation's oldest and most respected scholarly journals in the economics profession.

At a glance, the study appears to support efforts by the National Transportation Safety Board to lower the minimum BAC threshold to .05. However, Hansen said, the NTSB plan assumes an annual fatality reduction of 500 to 800 and fails to target the most dangerous drunk drivers.

"If you look at fatalities involving BAC between .05 and .08 there are about 800 a year," said Hansen, also a faculty research fellow of the National Bureau of Economic Research. "The NTSB has to be assuming that everyone who is now drunk driving at those levels is going to stop drinking and driving when the limit is lowered to .05."

In reality, he said, most fatal accidents involved drivers with BACs ranging from .13 to .24. In Washington, he said, the average drunk driver involved in a fatality had BACs at least two times the legal limit.

"These drivers are the most costly. In terms of fatality risk, a person with a BAC of .15 is about 20-30 times more dangerous than a person who is sober," Hansen said. "I think we might see even greater benefits if we were to increase the sanctions, or punishments, more steeply along the BAC distribution."

An additional step, he said, would be to lower the threshold for aggravated BAC to .12. Such steps, he wrote in the study, might make drivers "internalize the external costs of drunk driving."

To add perspective on social costs of drunk driving, Hansen cited statistics of the National Highway Traffic and Safety Administration from 1975 to 2012. There were 585,136 deaths linked to drunk driving. In comparison, he wrote, there were 725,347 murders in same period.


Source: Benjamin Hansen, assistant professor of economics, 541-346-4658,

Note: The University of Oregon is equipped with an on-campus television studio with a point-of-origin Vyvx connection, which provides broadcast-quality video to networks worldwide via fiber optic network. In addition, there is video access to satellite uplink and audio access to an ISDN codec for broadcast-quality radio interviews.


Abstract of paper: What is BAC: NBER: Hansen faculty page: Department of Economics:

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.