Iván Sánchez Ortega wrote: > El Lunes, 3 de Noviembre de 2008, ael escribió: >> Ok, but while I was waiting for a reply, I found the josm validator page >> and it allows shared nodes if the ways are tagged with different levels. >> So it certainly seems to think that is permitted. The router seems to >> ignore level tags: perhaps they should be checked and a route flagged as >> suspect if it "jumps" levels at a common node? > > So entering or exiting a bridge (or tunnel) should raise a warning on the > router?
The wiki says that junctions with tunnels and bridges should have short sections to avoid that sort of ambiguity. I was considering where different levels *cross*, meaning sections of each way with consistent levels either side of the shared node. Of course, I worry about the complexity of the algorithms that the router would need to employ and the consequent slowing down: at present it seems pleasingly fast. Reflecting further on how I got into this habit which is basically unintuitive, I believe it happened right at the very start when I joined the project. On my first edit, I had lots of crossing ways. The josm validator then picked them up as errors/warnings (I don't remember which), refusing to upload them to the database without explicit confirmation. It included things like boundaries crossing roads without a common node in its objections which I now think was really misleading. I was then so new, that I just assumed that the validator knew better than I did. ael _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
