Felix wrote:
But that change causes problems for other parts. There are some highway=residential areas without ways that cross them, so in order to have routing work in some inner city cases, you must make sure that you route along the edges.
Yes, I'm aware of this, I only pointed this option to check where the problem lies. This wouldnt be a good solution.
If multipolygons were treated the same way as relations, that would make it easier to make sure only one routable highway gets created (because add highway onto highway would not add the highway, because there is already an underlying highway).
The only thing I could think that does cause problems, if two routable lines are on top of each other, and both have the same road_type and same road_speed. Maybe there could be a check in the mkgmap continue function, never to create two routable lines on top of each other, if both road_speed and road_type are identical.
Yes thats the case here I think, there are two lines on top of each other with different road_classes and road_speeds: 0x05 road_class=1 road_speed=3 0x06 road_class=0 road_speed=2