Inside the Cadillac STS sedan, augmented with a wireless communication system. The dashboard includes a digital display that shows icons whenever a car is within a quarter of a mile. The icon may change from green to yellow if the car comes within cautionary distance. If a collision seems likely the icon will change to red, and the seat will begin to vibrate, alerting the driver to stop or change lanes. If turned on, an automatic breaking feature will stop the car immediately in such an event.