Ignition interlock devices (IIDs) are designed to prevent impaired drivers from driving their vehicles. They require that the breath sample be free of alcohol before the vehicle’s engine will start. But are ignition interlock devices effective in reducing deaths from traffic crashes?

Study

Researchers explored that question. Some states require IIDs on the cars of all those convicted of drunk driving.

They looked at the traffic crashes related to alcohol death rates. Then they compared of states with and without such laws. There were 18 states with these laws and 32 without them. The researchers used federal agency data.

The effects of the laws were clear three years after they started. The alcohol related traffic death rates in states with the laws was 4.7 per 100,000 drivers each year. For the states without the laws, the rate was 5.5. That’s a 15% advantage by states with the law.

Problems

There are many problems with IIDs. Someone other than the driver can blow into the sensor. The devices don’t actually measure blood alcohol concentration (BAC). They only estimate it. The devices are subject to much error. These factors can harm individual drivers. Yet the IIDs are be effective in reducing alcohol traffic deaths related to alcohol.

The researchers drew a logical conclusion. “Interlocks are a life-saving technology that merit wider use.”

Ignition Interlock Devices Effective in Reducing Deaths?

Resources

Web

• • How Long Does Alcohol Stay in Your Body?
  • How Can I Sober-Up Fast?
  • Accuracy of Breath Testers.
  • Drinking and Driving.
  • Alcohol Problems?
  • Self-Help Resources.

Source

• • Kaufman, E., and Wiebe, D. Impact of state ignition interlock laws on alcohol-involved crash deaths. Am J Pub Health.

Readings

• • Carter, P., et al. Alcohol ignition interlock installation in new vehicles. Alc Clin Exper Res, 37, 149A.
  • Palmer, T. Alcohol Ignition Interlocks.
  • Tiessart, E. Alcohol Ignition Interlock Programs.

Note

• • This site gives no advice.