In defence of the µ, I actually use it more than the other two, for micro- units.

The ¤ is the symbol for any currency but I have never seen it used in the wild.

I’d say 2, 3 and 4 can make sense depending on which one reflects more accurately the reality on the ground. The problem is that different mappers will answer differently if you ask them “is this part of the sidewalk or is this a path connecting sidewalk and street?”. I don’t think there is a clean cut answer to your question, but wait for others to chime in.

This is the best I could find: https://help.openstreetmap.org/questions/62074/how-to-tag-emergency-exit-staircase

There is an approved tag, 4wd_only, that fits very well. But as with all tags, it’s up to the engines to recognise and honor it.

A way to fine tune it would be using the acess restrictions. Maybe vehicle=no, ohv=yes? But I’m not sure whether routing engines are so vehicle aware.

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I don’t want to answer a specific user about the name connotations but, isn’t the load of a word dependant of the intention? My friends and I call each other whores. And conversely one can use “woman” as a very badly loaded vocative.

It’s so fun and such an easy way to give back to osm.

I didn’t, and I was looking for something similar, thanks!