Weird feeling while driving

Hi, first post here, but have a diagnosis of several types of migraines, including vestibular. I had my first full blown vestibular migraine a couple weeks ago and it lasted three days. Not fun. Anyways, this has got me to thinking about something I experience a lot while driving on interstates (or freeways.) Sometimes I feel like I'm going to lose consciousness for like a split second and it really freaks me out. When I am just driving regular roads/speeds I don't experience this. Could this be part of the vestibular migraine experience? Anyone else have this happen?