Of course, and some vision disabilities do require exceptions or a special license. However, my experience with making websites accessible has taught me that A

Of course, and some vision disabilities do require exceptions or a special license. However, my experience with making websites accessible has taught me that ADA, and WCAG specifically apply to even people with minor vision disabilities which most likely, do not require a special license to drive. As my edit indicates, ADA only really applies to "the public" and so therefore private vehicles are probably exempt.