On 06/07/2010 21:02, Ulf Lamping wrote:
Am 06.07.2010 20:38, schrieb Colin Smale:
On 06/07/2010 18:44, Richard Mann wrote:
I'm not really clear what is the value of tagging a "zone", except in
a note. Why not just use the standard maxspeed tag?
+1
Here in NL it warns you that the given road sign (could be maxspeed,
could be some other restriction) is valid "until further notice" i.e.
until you leave the Zone. Without the Zone indication the restrictions
lose their official validity at the next junction, which leads to speed
limits etc. having to be repeated very frequently. So it is really only
a shorthand notation to save money on signs and to reduce the clutter of
street furniture. The default speed limit in built-up areas is 50kph so
that actually rarely needs to be signed at all. But to make an area
limited to 20kph means it has to be signed explicitly.
It sure would make life easier if you could just draw a (temporary)
polygon and get Potlatch to set maxspeed=20 on all enclosed roads
though...
Well, no. Two different things here:
a) What's the actual maxspeed value
b) What's the cause of the actual maxspeed value
Wether b) needs to be tagged or not is a matter of personal opinion -
further discussions on this are therefore pretty much pointless ...
It was a long and hard discussion on talk-de that b shouldn't be
replacing a altogether - I'm personally very glad that this concensus
was made.
If someone want's to specially tag b), I don't see a reason not let
him do it that way. I'm not doing it but it won't harm anyone and will
save us from ongoing discussions if we want to tag the actual value OR
the inherent cause of it (sign, zone, ...).
Despite your opening sentence we agree. I was trying to make clear that
there is nothing special about the actual max speed in a "30 Zone", only
the way it is signed on the ground is different (for reasons I
explained). So IMHO all ways should have their maxspeed indicated
individually in the traditional way, and if someone wants to draw a
polygon to indicate the limits of the zone, well, OSM won't stop them.
The polygon I was talking about was only a simple way of selecting a
whole bunch of streets in one go with the intention of making a simple
edit (e.g. add maxspeed=30) to all of them as I can see the manual
one-by-one method getting rather tedious. As John Smith mentioned, there
appears to be some support in JOSM for this.
Colin
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