Hi Andrzej, thanks for your comments!
Hi,
does roads have to have the same post code? I don't know internal representation of these data, but in mp sources single road can have parts with different post code or city/region.
AFAIK roads cannot have more than one postcode (with the current mkgmap implementation...).
Do you check angle at which roads are merged?
Not yet.
Imagine a two-way road, which splits into 2 one-way roads before a crossroad. You can get this one-way roads merged. I don't know if this would be a problem for routing, but a weird layout anyway.
Yeah, sounds reasonable. I will add that. Which angle do you think is the max angle I should allow? 90, 120, 130, 160? I guess 130 should be allowed.
Or you can get a crossroad where roads can be merged in many configurations. In that case I would prefer to get straight roads after merging.
Sounds also reasonable. That is a slightly bigger change but I probably will add that too.
If you merge two roads, that form a turn at a crossover, there could be missing announcement from navigation. This probably depends on angle, but I'm not sure about details. Again, I prefer to merge only roads that goes nearly straight.
What do you mean with "turn at a crossover"? I am not sure... Can you post an ASCII drawing? WanMil