I have a part that drives as well. She is rather.. .hmm.. .she can be a bit "controlling" at times, and she makes quite sure that nobody else besides the two of us drive. There are safeguards she uses, but once you're actually driving if no one is in charge, it could get hairy. Perhaps, if you can identify a mature, adult part you guys could work out a system. I don't know how mine did it, but it seems to work pretty well. The only thing that kind of freaks me out is sometimes I'll "come aware" in the car and not recall starting, or I'll be the one to start driving and then find myself somewhere I don't remember going to.