The driving scenario is dissociation, but so is floating above your body looking down or completely losing time and not remembering at all. It's actually a spectrum, so the driving one is pretty normal. The more serious it gets, the more it is actually a symptom of something. For me, I lose time or just kinda stare off into space mostly. I also have a dissociative disorder tho, so my dissociation is a little more severe than some.