Hi there,
There are a lot of other tagging variants that aren't "correct", but have no practical consequences. For example there was a bunch of motocar=no, motorcycle=no, foot=yes, bicycle=yes on the other end of the hill I live on, ok doesn't really reflect the real legal situation (and incorrectly allows mofas), but it wouldn't stop hiking and bicycle routing (or force you to ignore the tagging).
For an overview of the (explicitly) tagged access restrictions, you can also visit
Cheers, Thomas