On Tue, Dec 1, 2009 at 2:42 PM, Steve Bennett Be careful. The question about the junction node is NOT about routing but about physical modeling. Even if both roads are not allowing turning left or right, you have to add a junction node (and the relations about turning restrictions), othewise we will interpret them as being at different levels and perhaps the tags "layer" and "bridge" are missing. It is the same if a road is crossing a railway : add a junction node if they are at the same physical level (then add the tag junction=crossing or level_crossing) and DON'T create a junction node if they are at different levels (then add the tags bridge/tunnel/layer as usual).
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