Laws requiring all impaired-driving offenders to install alcohol interlocks reduce the number of impaired drivers in fatal crashes by 16 percent, a new study by the Insurance Institute for Highway Safety shows. If all states without such laws adopted them, more than 500 additional lives could be saved each year.
Alcohol interlocks are in-vehicle breath-testing units that require a blood alcohol concentration (BAC) below a certain level, typically somewhere between 0.02 and 0.04 percent, before the vehicle can be started.
More than a quarter of U.S. crash deaths occur in crashes in which at least one driver has a BAC
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