What is the purpose of an Ignition Interlock Device?

The purpose of an Ignition Interlock Device is to prevent driving after drinking alcohol. This device is installed in a vehicle and requires the driver to provide a breath sample to measure their blood alcohol concentration (BAC) before the engine can be started. If the driver's BAC is above a predetermined limit, the car will not start. This technology aims to reduce instances of drunk driving by ensuring that individuals who have consumed alcohol are unable to operate the vehicle, thus promoting road safety and discouraging impaired driving.

The other choices do not accurately describe the function of an Ignition Interlock Device. Starting a car without a key, monitoring speeding violations, or tracking mileage for insurance purposes pertains to different types of automotive technology and systems unrelated to the prevention of alcohol-related driving offenses.