My 2004 cad. srx showed a left rear flat tire. i pulled the vehicle to a level, asphalted, scenic overlook area, 23 miles from page, az. i could not get the shifter from drive into park gear, nor would the key turn or release from the ignition. i got out to check and change tire, spare would not release, either. i called on-star, gave emergency details, to first advisor, then advance diagnostics. i got out of car, it surged, backwards, with the emergency brake, completely on, and it accelerated, taking me with it, i pushed away, and it kept accelerating over the scenic overlook, being destroyed. on-star never contacted the police, ambulance, or me, even 1 week after the accident, i had to call them and request the audio or transcript of the malfunctions, and crash. *nm