The present invention provides motor vehicle safety enhancement devices which, once activated, are not prematurely deactivated. In an embodiment, an electrically controllable safety device for use by an occupant of a motor vehicle includes a safety enhancer and a controller. The controller and the safety enhancer are electrically coupled to the vehicle's electrical ignition system, so that the controller may only activate the safety enhancer while the motor is on and, once activated, the safety enhancer may only be deactivated by turning the motor off. A stimulator to rouse a sleepy driver of a vehicle is provided including a signal generator capable of rousing the driver and a controller to activate the signal generator. The controller may include a momentary switch, a relay, and a diode.