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On 2012-12-03 20:27, Ole Nielsen wrote :<br>
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<blockquote cite="mid:50BCFD2D.50008@xs4all.nl" type="cite">BTW, I'm
not sure how useful the wet tag (old style or new style) is. You
will need some damn precise and detailed weather forecasts for a
route planner to be able to use such information. And usually it
is only fairly short sections of highway having such tags so the
impact is minimal (and in my experience drivers pretty much ignore
such signs anyway).
<br>
</blockquote>
answer from the wiki:<br>
<blockquote type="cite">The <a
href="http://wiki.openstreetmap.org/wiki/Key:maxspeed"><tt
style="background-color:#e0e0f0; white-space:pre;" dir="ltr"><strong
class="selflink">maxspeed</strong>=*</tt></a> <a
href="http://wiki.openstreetmap.org/wiki/Tag" title="Tag"
class="mw-redirect">tag</a> is used to define the maximum legal
<a href="http://wiki.openstreetmap.org/wiki/Speed_limits"
title="Speed limits">speed limit</a> for general traffic on a
particular road, railway or waterway.<br>
</blockquote>
Maxspeed is not a speed to time routes but a legal information. By
not mentioning a lower speed than normal, the information is
incomplete and liable to be called dangerous in some places where
wet speed is justified. Even more so for :snow and/or :ice maxspeed.<br>
<br>
Speed to predict journey duration can be based on data recorded by
some GPS manufacturers on some GPS devices of their customers. It
can be very complicated, using location and time. The simplest tag
would be speed:average.<br>
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