I have a severe visual impairment and use a white cane for mobility. Trust me, you don’t want me driving. 
My city has an excellent public transit system, so I get around with a combination of walking, buses, trains, boats, and cabs. If I could see well, I’d actually choose biking over driving. I think being able to ride a bike everywhere would be awesome.
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I’ve heard someone say the BG should be over 80 to drive. Someone else said at least 100. I suspect there may be differences by state and by country. If you are in the US, check for any specific laws by state here:
http://www.diabetes.org/living-with-diabetes/know-your-rights/discrimination/drivers-licenses/drivers-license-laws-by-state.html?referrer=https://www.google.com/
If in another country you’d need to search for information by country. Of course, a major consideration is that one shouldn’t be driving with a hypo, and could be found legally responsible for an accident if one has a hypo when involved in an accident. In the UK, I know that one has to go through extra hoops if one is on insulin and possibly on other diabetic meds, as well.