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. Cheers, -- Marc Provencher [email protected]
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