[Talk-GB] Unfit for motors - tagging for routing

[Richard Fairhurst]

Robert Whittaker (OSM) wrote:
> Instead I've used highway=track based on the physical 
> appearance, and then added designation=
> unclassified_highway to record the legal classification.

Agreed: I often do something similar.

In this case, though, I'm not entirely comfortable with highway=service as a
tag, because there's no consensus that highway=service implies a right of
through-passage for (among others) cyclists, pedestrians etc. A routing
engine would not be off-beam to interpret it as access=destination; so it
may well be the case that, by "fixing" routing for cars, it's breaking it
for other users.

As ever, we tag what's on the ground. In this case, there's a sign advising
"Unsuitable for motors". So rather than "motor_vehicle=unsuitable", which
implies a value judgement on OSM's part ("we say this is unsuitable"), we
could perhaps use the subtly different "motor_vehicle=not_advised" (with
"source:motor_vehicle=signage" for the truly pernickety), or something like
that.

It's all a bit angels-on-a-pin until any routing clients actually take note
of the tags, of course, but it's certainly an issue worth considering.

cheers
Richard





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