Tag:sidewalk=yes
 sidewalk =
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| Description |
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Denotes whether a highway has got a sidewalk, but not at which side. 
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| Group: highways |
| Used on these elements |
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| Requires |
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| See also |
| Status: de facto |
| Tools for this tag |
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sidewalk= denotes whether a highway=* has got a sidewalk but not at which side.
Usage
On its own, sidewalk= shouldn't be used because data consumers can't know where exactly a sidepath exist on a road. It should either be replaced with left, both or right or be suffixed with a direction (compare the current practice with sidewalk=separate).
It's also sometimes used on a highway=footway or highway=path to mark that either is a sidewalk. This is problematic because data consumers have to differentiate between both uses or assume any way with sidewalk= has a sidewalk, footway or otherwise. The better supported alternative is to use footway=sidewalk by default and/or the proposed is_sidepath=*.