I visited an otoneurologist and this was one of the things they tested me for (I believe it was vestibular testing?)
I have to keep my eyes covered when I ride in a car now because the light is too bright, but when I had them uncovered I had horrible motion sickness every time. This was never a problem for me until my migraines become chronic. We keep the zofran handy, and also we found it helps if I only ride in a car after eating something.