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SA-6 Data Details

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SA-6 Increase the number of States with mandatory ignition interlock laws for first and repeat impaired driving offenders in the United States

About the Data

Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.

Data Source: 
Status of State Ignition Interlock Laws; Mothers Against Drunk Driving (MADD)
Changed Since the Healthy People 2020 Launch: 
No
Measure: 
number
Baseline (Year): 
13 (2009)
Target: 
51
Target-Setting Method: 
Total coverage
Target-Setting Method Justification: 
Ignition interlocks have been shown to reduce recidivism among impaired driving offenders by 50 to 90 percent when they are in use. Use rates historically have been low. Since 2006, many States have enacted or amended their ignition interlock laws. Currently, all States have enacted an ignition interlock law of some type; 16 States have enacted mandatory interlock laws for all offenders (up from one State in 2006). During this time, interlock use has more than doubled (up from 100,000 in 2006 to 212,000 in 2010). However, many offenders continue to avoid interlock use. Each year in the United States, 1.4 million impaired driving arrests occur. Increases in ignition interlock use rates have been highest in States that have enacted mandatory interlock laws for all offenders.
Numerator: 

Number of States with mandatory ignition interlock laws for first and repeat impaired driving offenders

Comparable Healthy People 2010 Objective: 
Not applicable
Data Collection Frequency: 
Annual
Methodology Notes: 

    Almost all states have some sort of ignition interlock law. At the launch of HP 2020, Alabama and South Dakota do not have an ignition interlock law. A number of States have mandatory ignition interlock provisions for all offenses. Other States offer a strong incentive to install an interlock device on the first conviction. Hawaii’s mandatory ignition interlock law goes into effect in 2011.

References

Additional resources about the objective

  1. Mothers Against Drunk Driving: .Status of State Ignition Interlock Laws. Home page. August 2010.
  2. National Conference of State Legislatures: Issues & Research - Transportation - State Ignition Interlock Laws. Home page. August 2010. Questions Used To Obtain the National Baseline Data