What is the purpose of an ignition interlock device?

The purpose of an ignition interlock device is to analyze the driver's breath for alcohol before allowing the vehicle to start. This device is typically installed in the vehicle of individuals convicted of driving under the influence (DUI) or similar offenses. It requires the driver to provide a breath sample, and if alcohol is detected at or above a predetermined limit, the vehicle will not start. This serves to promote road safety by ensuring that individuals who may be impaired do not operate a vehicle, thus reducing the risk of accidents and encouraging responsible alcohol consumption.

In the context of the other options, preventing vehicle theft, aiding in vehicle tracking, and enhancing vehicle performance do not align with the primary function of an ignition interlock device, which is specifically focused on monitoring the driver's alcohol consumption before permitting vehicle operation.