Ignition interlock systems in cars have prevented 1.77 million attempts at drunk driving since 1999, according to a new report by Mothers Against Drunk Driving (MADD).
The report, released Wednesday, is based on data from the 11 major manufacturers of ignition interlock systems, the Associated Press reports.
Ignition interlock devices are wired into vehicles. A person convicted of drunk driving must blow into the device to determine their blood alcohol concentration. The device has a preset level for blood alcohol concentration. If a person blows into it when they are over the set limit, the vehicle will not start.
The report found ignition interlocks have prevented 1.77 million attempts by a driver to drive with an illegal blood alcohol concentration of .08 or higher, which is legally considered drunk driving in all states.