[Tagging] Adding directionality to stop signs

[Volker Schmidt]

Given the effect of the stopping process on the overall travel time (mainly
for cars), we need a way that can be used by routing algorithms.
I am inserting them in quantity, but only in the simple way of a node on
the way. "My" stop signs apply to the nearest junction. This should in
principle allow a routing algorithm to determine the directionality of the
sign. I would consider having to create (and manage) relations for this
tedious, and error prone in case of editing.
BTW the Stop sign is even more frequent in Italy than in the US, but it
influences much less the travel time, because drivers simply don't stop
most of the time, contrary to the practice in the US, or Germany, or the UK.
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