Actually, there are many visually impaired people who can, and do, drive. As an example, I know a woman in her sixties who is classed as visually impaired. She can see well enough to get herself about but she can't make out peoples faces until she is fairly close and has to have a magnifying glass to read even fairly large text. She has been assessed as safe to drive, but is excluded from driving at night.
Well, there is a lot of rational thought (and frankly human lives) sacrificed at the altar of the personal automobile. Limousines with 200 hp, huge trucks with bull bars but can't see the pedestrian to the right, sound systems, entertainment systems, licenses that expire never, are checked never, 20% percent of space in SF for storing huge heaps of metal for >90% of the day but "there is no space" and people can't make rent, ..
