[Tagging] Foot / sidewalk access tagging

[Brian M. Sperlongano]

Hello,

I am the author of a data consumer which generates a list of streets that
are accessible to walkers and joggers. The idea is that a user would have a
map of the streets in their town and can challenge themselves to walk/jog
down every street, and they can look at statistics on which streets they've
completed.  I use a 25-meter rule, so if a user can walk along the
shoulder, or on a sidewalk/pavement, or in the verge, that's acceptable.

I recently came across an unexpected tagging combination and I would like
to understand how folks in various places would interpret this:

highway=<whatever>
foot=no
sidewalk=separate

In my software's logic, I've made the assumption that foot=* applies to
"the whole of the road" including the roadway, shoulders, verge, sidewalks,
and so forth and thus excluded any roads that include that tag, regardless
of other tagging. I came to understand that this tagging was used by a
mapper to indicate that "pedestrians are not allowed on the roadway,
however, they are allowed on the sidewalk"

Would folks regard that as accurate data modeling?  I.e. should I change my
software to treat streets tagged in this way as pedestrian-accessible, or
would folks regard this combination as a tagging error?
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