Assessing the Deterrent Effects of Ignition Interlock Devices.

Area of Science:

• Public Health
• Criminology
• Behavioral Science

Background:

• Ignition interlock devices (IIDs) are proven to reduce repeat driving under the influence (DUI) offenses (specific deterrence).
• Limited research exists on the general deterrent effects of IIDs on individuals before their first DUI conviction.

Purpose of the Study:

• To assess the general deterrent effects of various penalties for alcohol-impaired driving.
• To evaluate the impact of ignition interlock devices on deterring drunk driving behavior.

Main Methods:

• A discrete choice experiment was conducted with 583 U.S. adults who consume alcohol weekly.
• Participants evaluated five penalties (fine, jail, IID, license suspension, treatment) under varying police enforcement scenarios (1% vs. 20% detection risk).

Main Results:

• A 1-year ignition interlock device penalty demonstrated substantial general deterrent effects.
• The IID's deterrent impact was comparable to a 20-fold increase in police enforcement or a $2,000 fine increase.
• A 1-year IID penalty was equivalent to a 10-day jail sentence in deterring drunk driving.

Conclusions:

• Widespread adoption of IIDs as DUI penalties can yield significant general deterrence.
• IIDs offer a promising alternative to traditional criminalization, promoting rehabilitation and immobilization over incarceration.