Hi, I'm new to this board but when I saw your post I just had to respond. My auras also last 30 minutes and last Nov., I got one while driving with my two kids bringing, my older son to preschool (7 minutes from my house thank goodness). I got him to school and ran back to the car with my younger son and used all of my powers of concentration to get us home pronto. You might be thinking "what bad judgement" but I knew I had time to get home before the pain kicked in (at the time I was still nursing my younger son and couldn't take my Imitrex) and I could still see well enough.
If I were you, had frequent migraines, and was regularly driving through unsafe areas away from my neighborhood or town, I would consider programming the local police dept. phone numbers into my cell phone. Then if I had an aura and was more than a couple of minutes from my destination, I could call the police to request some protection while waiting out the aura.
I'm curious -- you mention that you would only be pulled over for 30 minutes. What would happen when the pain arrives? For me, if I squint and concentrate hard, I can drive for a little while but when the pain comes, unless I've taken Imitrex, I'm vomiting and crying and cannot function at all.