Don't forget the steering interlock. Turning the key too far past "off"locks the steering--not good in an emergency situation. By the way, this happened to a friend of mine 20 years ago. Husband was driving and has a heart attack, wife turned the kep to "off" , but went too far and locked the steering so she had no control. She couldn't get to the brakes and the steering wheel locked. Ended up hitting bridge supports, and broke both her knees. Husband survived OK.
Unintentional consequences are always ready to complicate the situation.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags