![]() At random times after the engine has been started, the IID will require another breath sample, referred to as a rolling retest. A breath sample is not required to start the vehicle if the engine has been running within a time-out period, to allow quick re-starts in case the vehicle stalls. ![]() At that point, the vehicle can be started as normal. It is a form of electronic monitoring.Īn ignition interlock interrupts the signal from the ignition to the starter until a valid breath sample is provided that meets maximal alcohol guidelines in that jursdiction. The interlock device is located inside the vehicle, near the driver’s seat, and is directly connected to the engine’s ignition system. If the resultant breath-alcohol concentration analyzed result is greater than the programmed blood alcohol concentration (which varies between countries), the device prevents the engine from being started. It requires the driver to blow into a mouthpiece on the device before starting or continuing to operate the vehicle. A Draeger ignition interlock device (red arrow) in a Scania busĪn ignition interlock device or breath alcohol ignition interlock device ( IID or BAIID) is a breathalyzer for an individual's vehicle.
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