This should have been "reply all". On Thu, Apr 8, 2010 at 3:46 PM, Michael Barabanov < [email protected]> wrote:
> AFAIK, the garmin maps produced with osm2mp/cgpsmapper do respect turn > restrictions. > > On Thu, Apr 8, 2010 at 3:01 PM, Marc Provencher > <[email protected]>wrote: > >> I did look at turn restrictions. >> >> But would the Garmin auto-routing algorithms even consider those >> restrictions? >> >> Not without pain to implement either. The editors would need to make this >> a one or two click solution. >> >> Not complaining, just thinking aloud. >> >> Marc. >> >> >> >> On Thu, Apr 8, 2010 at 3:36 PM, Richard Weait <[email protected]> wrote: >> >>> On Thu, Apr 8, 2010 at 4:33 PM, Marc Provencher <[email protected]> >>> wrote: >>> > I recently posted with an open question asking how others map junction >>> nodes >>> > at complex intersections. >>> > >>> > Today I was trying to reproduce certain routing errors which I observed >>> > while driving, and was able to cause Mapsource to route me through an >>> > illegal U-turn, because of a misplaced junction node where there >>> shouldn't >>> > be one. >>> > >>> > This picture shows the U-turn: >>> > >>> http://provencher.smugmug.com/Other/Misc/IllegalUturn/831296827_sYc5e-X3.jpg >>> > >>> > The problem lies with the access ramp,which has a junction node on both >>> ways >>> > of the divided residential road. And for some reason the routing >>> algorithm >>> > doesn' t consider this a U-turn, even thought the "avoid U-turns" >>> setting >>> > is enabled. >>> > >>> > Actually, the real problem is that the routing algorithm is using these >>> > "connecting ways" between the two sides of a divided road, to make a >>> > U-turn. I'm not sure if this problem can be resolved easily. >>> > >>> > In my attached picture, removing the junction node which I thought was >>> the >>> > problem simply moved the problem to another intersection. >>> >>> I see this fault from navigation systems too. I'm not sure that the >>> commercial vendors worry about this error. Their systems seem to >>> suggest those illegal turns often enough. >>> >>> We can do better, and eliminate these routing errors with turn >>> restriction relations. >>> http://wiki.openstreetmap.org/wiki/Turn_restrictions >>> >>> See what you think. >>> >> >> >> >> -- >> Marc Provencher >> [email protected] >> >> _______________________________________________ >> Talk-ca mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/talk-ca >> >> >
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