Good question, sospan.

I was advised early-on in my injury (by my primary care physician) to not drive until the vertigo experienced while driving was no longer an issue for me.

The rather nonchalant neurologist whom I saw immediately after the auto collision, for followup, never even addressed driving until I urgently asked about it. His reply, "That's up to you."

The BIA-USA tells us:

Driving after Brain Injury - Brain Injury Association of America
www.biausa.org/_literature_43315/driving_after_brain_injury :

"Each state establishes its own rules and
regulations on driving, and the laws about
when a license can be taken away from a
driver vary widely from state to state. Some
states require physicians to report to the
authorized state licensing agency if they
have a patient for whom driving may no
longer be safe. Other states require
licensed drivers to report any change in
medical status before they resume driving."