[Talk-GB] Implicit speed limits: What to tag in built-up areas?

[Richard Fairhurst]

Philip Barnes wrote:
> I wouldn't invent a type tag, it's maxspeed = 20 mph 
> because that's what the sign says. There is nothing special 
> about these areas.

No, 20mph zones and roads with 20mph limits are different legal concepts and
are signed differently. A 20mph zone must have physical traffic calming. See
TSRGD Schedule 10.

That said, for OSM purposes, I agreed that there is no reason to add
additional tags over and above maxspeed=. In practice all 20mph and 30mph
limits are signed, and whether or not there are repeater signs makes no
difference: the speed limits are discernible, verifiable facts. 

Going back to the Street Complete issue which prompted this thread, in
https://github.com/westnordost/StreetComplete/issues/1037#issuecomment-385278398,
suggestion #1 (the "quest" should be about speed limits, not the presence or
absence of signs) is pretty clearly the way to go.

Richard



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