For parents who are reticent to let their kids drive their cars,  Ford has come up with MyKey. Available on the 2010 Focus Coupe to start, the option can limit the vehicle’s top speed to 80 mph, limit the stereo volume to only 44% max, and issue an annoying chime if the seat belts aren’t connected or if the car reaches 45, 55, or 65 mph. The system uses Ford’s SecuriLock anti-theft system that identifies which key is in the ignition.