<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p>I did not think of traffic directions, good point! I think oneway
makes sense better than traffic_direction. This would means that
oneway apply to traffic whether it is on ground, water, air,
rail... much more easier for routing engines (and for amphibian
vehicles such as Duck tours!).<br>
</p>
The usecase I've originaly found (but I did not check all 17596
usage) was a usage for intermitent streams (and some which are
culverts!) in the middle of the desert of Colorado. In this specific
case I don't think any traffic is feasible.
<p>So the question now is: does oneway apply to the direction of the
stream or to the direction of the traffic?</p>
<ul>
<li>The wiki pages says oneway is used to "indicate the access
restriction on highways and other linear features" (<a
href="http://wiki.openstreetmap.org/wiki/Key:oneway">http://wiki.openstreetmap.org/wiki/Key:oneway</a>).</li>
<li>The wiki requires to draw waterways downward (which makes
sense for me)</li>
<li><a href="http://wiki.openstreetmap.org/wiki/Inland_navigation">http://wiki.openstreetmap.org/wiki/Inland_navigation</a>
says nothing about traffic directions (but I think it's a real
need)</li>
<li>JOSM stays silent on this one.</li>
</ul>
<p>So I would say that oneway is valid for traffic directions on
waterways and oneway=yes means that this part of the waterway can
only be sailed downward. If my understanding is right, I propose
to update the waterway and oneway pages to say that oneway can be
used on waterways to represent the traffic direction.<br>
</p>
<p>But does it means that a river should be forked under a bridge
whenever traffic directions go under different arches?<br>
</p>
<p>Yours,<br>
</p>
<pre class="moz-signature" cols="72">LeTopographeFou</pre>
<div class="moz-cite-prefix">Le 17/09/2016 à 14:45, Colin Smale a
écrit :<br>
</div>
<blockquote cite="mid:cbbf666278e831474db3dd9245dcd3c6@xs4all.nl"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p>I would expect that the situation where the flow direction
conflicts with the traffic direction is likely to be quite short
- under bridges, around obstacles etc. In these cases we could
always call on our old friend "oneway=-1" or "oneway=reverse" to
mean "traffic direction is opposite to the flow direction".
Having to create a route relation is a bit of a sledgehammer to
crack a nut.</p>
<div> </div>
<p>//colin</p>
<p>On 2016-09-17 14:35, Dave F wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left:
#1010ff 2px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ignored -->I've
seen it used on navigable canals to indicate traffic direction.
<br>
If there is a route relation I think it should be indicate with
forward/backward roles.<br>
If not then for clarity, maybe something like
traffic_flow=backwards?<br>
Adding a route relation would be preferable though.<br>
<br>
Dave F. <br>
<br>
<div class="moz-cite-prefix">On 17/09/2016 13:20, Andy Townsend
wrote:</div>
<blockquote type="cite" style="padding: 0 0.4em; border-left:
#1010ff 2px solid; margin: 0">
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;">I've
certainly used "oneway=yes" on inland waterways to document
signed traffic flow control, so a blanket removal would make
no sense.</div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;"> </div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;">There
may be places where a previous mapper has tried to use it in
error to indicate water flow direction, but you'd need to
ask whoever the previous mapper was in each case (or use a
bit of common sense).</div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;"> </div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;">Cheers,</div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;">Andy</div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;"> </div>
<div style="width: 100%; font-size: initial; font-family:
Calibri, 'Slate Pro', sans-serif, sans-serif; color:
#1f497d; text-align: initial; background-color: #ffffff;"> </div>
<table style="background-color: white; border-spacing: 0px;"
width="100%">
<tbody>
<tr>
<td style="font-size: initial; text-align: initial;
background-color: #ffffff;" colspan="2">
<div style="border-style: solid none none;
border-top-color: #b5c4df; border-top-width: 1pt;
padding: 3pt 0in 0in; font-family: Tahoma, 'BB Alpha
Sans', 'Slate Pro'; font-size: 10pt;">
<div><strong>From: </strong>LeTopographeFou</div>
<div><strong>Sent: </strong>Saturday, 17 September
2016 13:17</div>
<div><strong>To: </strong><a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:tagging@openstreetmap.org">tagging@openstreetmap.org</a></div>
<div><strong>Reply To: </strong>Tag discussion,
strategy and related tools</div>
<div><strong>Subject: </strong>[Tagging] Use of
oneway=yes on waterways</div>
</div>
</td>
</tr>
</tbody>
</table>
<br>
<div id="_originalContent" style="background-color: #ffffff;">
<p>Hi</p>
<p>According to the waterway=stream wiki page (<a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream">http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream</a>):</p>
<blockquote type="cite" style="padding: 0 0.4em;
border-left: #1010ff 2px solid; margin: 0">
<p><em>If a flow exists, the direction of the way must be
downstream (i.e. the way direction follows the flow)</em></p>
</blockquote>
<p>As of today there is a very small percentage of streams
(17593 ways according to taginfo, 0.23%) with oneway=yes.</p>
<p>Is there any undocumented purpose? Is it ok and safe to
delete oneway=yes tags for streams?</p>
<p>The same question can apply to drains, ditches, canals...</p>
<p>Yours,</p>
<br>
<pre class="moz-signature">--
LeTopographeFou</pre>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre>_______________________________________________
Tagging mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a>
</pre>
</blockquote>
<br>
<!-- html ignored --><br>
<div class="pre" style="margin: 0; padding: 0; font-family:
monospace">_______________________________________________<br>
Tagging mailing list<br>
<a moz-do-not-send="true"
href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a><br>
<a moz-do-not-send="true"
href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a></div>
</blockquote>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Tagging mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a>
</pre>
</blockquote>
<br>
</body>
</html>