[Tagging] More human readable values for traffic signs

[Lauri Kytömaa]

André Pirard wrote:I think he is referring to the "do not enter" sign, a
red circle with a horizontal white bar.

>The rectangular F19
<http://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#F19> is
disputably classified as "information"
>The no-U-turn sign C33
<http://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#C33> might be
thought of as one-way, but
>There is no round one-way sign that I know of.  But, of
>course, a follow the direction
<http://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#D1>ahead
<http://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#D1>D1
<http://wiki.openstreetmap.org/wiki/Road_signs_in_Belgium#D1> placed
withing a street

The osm ways do and can not match one-to-one with traffic signs.
The tag oneway=yes on an osm way does not only mean "this is
a _road_ with a oneway sign", but "traffic should not traverse this
way in the backward direction". For the simplest example, most
dual carriageway roads do not have a oneway traffic sign on either
carriageway, they might not even have a "no entry" sign for the
opposing direction carriageway (just a "pass this sign/obstacle on
the right" at the intersections, if even that).

Even the no entry (round red sign with a yellow/white horizontal
rectangle) sign _effectively_ makes a short section oneway: every
vehicle has length, so at some point coming from the "oneway"
direction, there's at least a small (but several meters) distance
where they aren't allowed to turn around - if they did, they would
unavoidably pass the no entry sign.

-- 
alv
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