This should have been "reply all".<div><br><div class="gmail_quote">On Thu, Apr 8, 2010 at 3:46 PM, Michael Barabanov <span dir="ltr"><<a href="mailto:michael.barabanov@gmail.com">michael.barabanov@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">AFAIK, the garmin maps produced with osm2mp/cgpsmapper do respect turn restrictions.<br><br><div class="gmail_quote"><div>
<div></div><div class="h5">On Thu, Apr 8, 2010 at 3:01 PM, Marc Provencher <span dir="ltr"><<a href="mailto:marc@marcprovencher.com" target="_blank">marc@marcprovencher.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div></div><div class="h5">I did look at turn restrictions.<br><br>But would the Garmin auto-routing algorithms even consider those restrictions?<br>
<br>Not without pain to implement either. The editors would need to make this a one or two click solution. <br>
<br>Not complaining, just thinking aloud.<br><font color="#888888"><br>Marc.</font><div><div></div><div><br><br><br><div class="gmail_quote">On Thu, Apr 8, 2010 at 3:36 PM, Richard Weait <span dir="ltr"><<a href="mailto:richard@weait.com" target="_blank">richard@weait.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204, 204, 204);padding-left:1ex"><div><div></div><div>On Thu, Apr 8, 2010 at 4:33 PM, Marc Provencher <<a href="mailto:marc@marcprovencher.com" target="_blank">marc@marcprovencher.com</a>> wrote:<br>
> I recently posted with an open question asking how others map junction nodes<br>
> at complex intersections.<br>
><br>
> Today I was trying to reproduce certain routing errors which I observed<br>
> while driving, and was able to cause Mapsource to route me through an<br>
> illegal U-turn, because of a misplaced junction node where there shouldn't<br>
> be one.<br>
><br>
> This picture shows the U-turn:<br>
> <a href="http://provencher.smugmug.com/Other/Misc/IllegalUturn/831296827_sYc5e-X3.jpg" target="_blank">http://provencher.smugmug.com/Other/Misc/IllegalUturn/831296827_sYc5e-X3.jpg</a><br>
><br>
> The problem lies with the access ramp,which has a junction node on both ways<br>
> of the divided residential road. And for some reason the routing algorithm<br>
> doesn' t consider this a U-turn, even thought the "avoid U-turns" setting<br>
> is enabled.<br>
><br>
> Actually, the real problem is that the routing algorithm is using these<br>
> "connecting ways" between the two sides of a divided road, to make a<br>
> U-turn. I'm not sure if this problem can be resolved easily.<br>
><br>
> In my attached picture, removing the junction node which I thought was the<br>
> problem simply moved the problem to another intersection.<br>
<br>
</div></div>I see this fault from navigation systems too. I'm not sure that the<br>
commercial vendors worry about this error. Their systems seem to<br>
suggest those illegal turns often enough.<br>
<br>
We can do better, and eliminate these routing errors with turn<br>
restriction relations.<br>
<a href="http://wiki.openstreetmap.org/wiki/Turn_restrictions" target="_blank">http://wiki.openstreetmap.org/wiki/Turn_restrictions</a><br>
<br>
See what you think.<br>
</blockquote></div><br><br clear="all"><br></div></div>-- <br><div><div></div><div>Marc Provencher<br><a href="mailto:marc@marcprovencher.com" target="_blank">marc@marcprovencher.com</a><br>
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