What is the purpose of an ignition interlock device?

The ignition interlock device serves a critical role in promoting safe driving by preventing the vehicle from starting if it detects alcohol on the driver's breath. This device is typically installed in vehicles for individuals who have been convicted of driving under the influence. It ensures that the driver has not consumed alcohol before starting the vehicle, thereby reducing the risk of accidents and enhancing overall road safety. By requiring the driver to blow into the device before starting the car, it acts as a proactive measure to prevent impaired driving, which can lead to serious consequences for the driver, passengers, and others on the road.

In contrast, the other options pertain to different functionalities that are not related to the primary goal of an ignition interlock device. For instance, measuring the vehicle's speed, navigating, or monitoring GPS locations do not address the issue of alcohol consumption and driving safety, which is the key focus of the ignition interlock device.