Hi, AFAICT the keys bridge and tunnel do currently not assume any default value for layer apart from the normal layer=0 that holds for all objects. While it of course is necessary to be able to specify the layer for both of these keys, it also seems to me that the "normal" case is that bridge should imply layer=1 and tunnel layer=-1. The wiki pages for bridge already states "In the easiest case the bridge gets the tag layer=1" and the one for tunnel "In the easiest case the tunnel gets the tag layer=-1"
When looking at a new area in JOSM, I as a rule run the validator, and one of the most frequent (in my totally unscientific, with no statistics to back it up gut-feeling) "mistakes" that it warns about (crossing ways) is bridges and tunnels without an accompanying layer tag. If I knew how I would try to verify this against the database... but alas I do not. I would therefore like to suggest that if it is possible bridge=yes should in the absence of a layer tag be interpreted as layer=1 and that tunnel=yes in the absence of a layer tag should be interpreted as layer=-1, in the same way as a junction=roundabout implies oneway=yes etc. I am quite new to OpenStreetMap, and if this has already been discussed, I would appreciate a pointer to the relevant discussion. Furthermore, if this kind of suggestions are better brought forth at the wiki, please tell me so. /Susanna
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