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Alcohol Ignition Interlocks and the Prevention of Alcohol Impaired Driving. National Highway Traffic Safety Administration Meeting on Use of Alcohol Ignition Interlocks for Reducing Impaired Driving Recidivism. Washington, DC  August 22, 2007. Adrian Lund, President.

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slide1

Alcohol Ignition Interlocks and the Prevention of Alcohol Impaired Driving

National Highway Traffic Safety Administration

Meeting on

Use of Alcohol Ignition Interlocks

for Reducing Impaired Driving Recidivism

Washington, DC  August 22, 2007

Adrian Lund, President

slide2

0.08 g/dL or more

0.15 g/dL or more

Percent of fatally injured drivers with BACs at or above 0.08 g/dL and 0.15 g/dL, 1982-2005

1982

85

90

95

2000

05

percent of fatally injured drivers with bacs at or above 0 08 g dl 2005 by gender and age
Percent of fatally injured drivers with BACs at or above 0.08 g/dL, 2005By gender and age
slide4
The Contribution of Drinking Drivers to Motor Vehicle Crash Fatalities
relative risk of fatal crash involvement for passenger vehicle drivers by bac zador et al 2000
Relative risk of fatal crash involvement for passenger vehicle drivers, by BAC Zador et al., 2000

g/dL BAC

potential lives saved in 2005 if all driver bacs reduced to zero by highest driver bac
Potential lives saved in 2005 if all driver BACs reduced to zeroBy highest driver BAC
slide10
Motor vehicle crash deaths involving drivers with DWI convictions in prior 3 yearsBy license status

prior convictions

maryland alcohol interlock study 1999
Maryland alcohol interlock study, 1999
  • Population: Drivers with multiple alcohol-related traffic offenses now eligible for license reinstatement
  • Study methods: Random assignment to interlock license restriction or to customary treatment program
  • Duration of study: Interlock assignment for one year. Offenders monitored for 2 years to assess effects when interlock on and when off
  • Interlock participation rate: about two-thirdsof interlock group had interlock installed for some part of the study period
dui re arrest rate during first year of interlocks 64 reduction in alcohol traffic violations
DUI re-arrest rate during first year of interlocks 64% reduction in alcohol traffic violations

interlock groupn = 698

controlsn = 689

dui re arrest rate during second year follow up no statistically significant difference
DUI re-arrest rate during second year follow-upNo statistically significant difference

interlock groupn = 681

controlsn = 643

(interlocks removed)

slide15
Potential lives saved in 2005 if BACs of drivers with prior DWI convictions within 3 years limited to specified maximums
slide16

Potential lives saved in 2005 if BACs of drivers with multiple prior DWI convictions within 3 years limited to specified maximums

alcohol ignition interlocks for drivers convicted of dwi pluses and minuses
Alcohol ignition interlocks for drivers convicted of DWIPluses and minuses

Pluses

  • Reduces recidivism by nearly 2/3
  • Reductions might be higher if installation rates were greater
  • Fatal crash reductions
    • 600-800 if applied to first offenders
    • 100 if multiple offenders
  • Natural laboratory to test new technology that could be applied to general population
    • more than 8,000 deaths prevented if limit set at 0.08 g/dl

Minuses

  • ?
minimum requirements of technologies that would be suitable for use in all vehicles
Minimum requirements of technologies that would be suitable for use in all vehicles
  • Small
  • Quick to use
  • Accurate
  • Reliable
  • Repeatable
  • Durable, robust
  • No or low maintenance
  • Virtually invisible to sober drivers
www iihs org
www.iihs.org

For more information:

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