How to tag *unusable* sidewalks?

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Thanks everybody for ideas! While there are several other possible combinations / alternatives, I’ve boiled the most promising choices to three presented below. I’m wondering what would people reading this prefer (I’m personally undecided between A and C)?

  • option A
    highway=residential
sidewalk=no
sidewalk:note=not usable for pedestrians 
  as it is 24/7 full of illegally parked cars
    pro: produces correct routing by default (i.e. does not route pedestrians there!); does not require any changes to current routers/renderers/editors/QA (easiest!)
    contra: while close, not really technically correct; details only readable by humans
  • option B
    highway=residential
sidewalk:both=yes
sidewalk:both:width=0.01
    pro: partially technically correct (but incorrect in practice); existing tags (semi-documented, but somewhat common use)
    contra: trolltagging; will produce bad routing by default; require changing all routers/renderers to produce wanted results (lots of work!); should better document tags
  • option C
    highway=residential
disused:sidewalk=both
    pro: more technically correct; documented (prefix) tag; produces correct routing by default (i.e. does not route pedestrians there!); does not require changes to routers/renderers
    contra: very-low-usage tags; require changing StreetComplete quest to skip those (only little work);

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