usually cars have 2 off positions - there's a kill switch position (just turn the key a little) and a full off position, which is when the steering locks. i discovered this the hard way on my e30 - the accelerator got stuck on the floor mats when i was on the highway and i put the car into full off, the steering locked, i lost power brakes, and i eventually went into the guard rail on a gentle bend, although i was only going about 20 at the time.
Pete7874 
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