VEHICLE WAS INADVERTANTLY TURNED OFF WHILE IN DRIVE, WHEN PARKING THE VEHICLE NO ALARM SOUNDED. UPON EXITING THE VEHICLE, THE VEHICLE BEGAN TO ROLL BACKWARDS, FORCING ME TO JUMP BACK INTO THE CAR AND JAM ON THE BRAKE. ONE WOULD THINK THAT AS A SAFETY MEASURE, THE CAR WOULD BE REQUIRED TO BE IN PARK, BEFORE TURNING OFF THE ENGINE. WHILE ITS CONCEIVABLE THAT IN AN EMERGENCY THE DRIVER MAY WANT TO TURN OFF THE VEHICLE WHILE IN GEAR, THIS WOULD BE VERY RARE, AND COULD BE ACCOMMODATED BY PROGRAMING THE OFF SWITCH TO REQUIRE MULTIPLE PUSHES OR HOLDING IN THE BUTTON FOR AN EXTENDED PERIOD. EXITING THE CAR WHEN IT IS NOT IN PARK IS A DANGEROUS SITUATION, JUST AS DANGEROUS AS TRYING TO START THE CAR WHILE IN GEAR, RESULTING IN UNEXPECTED MOVEMENT OF THE CAR. SINCE THE CAR REQUIRES THE GEARSHIFT TO BE IN PARK AND THE BRAKE ON BEFORE STARTING, ONE WOULD THINK A SIMILAR PROCESS WOULD BE USED FOR TURNING OFF THE VEHICLE.