Several years ago the US introduced a vehicle system called STAR. Given the wide expanses of wilderness it could be hours after an accident before anybody drove past and called an ambulance. With STAR, whenever the air bags trigger STAR reads the location from the GPS system, and then uses the mobile telephone to call the control centre, reporting the vehicles location. The control centre then call backs to the car's driver, and if there's no answer they immediately call the emergency services and have them dispatched to the accident.
***Imported from old blog***