As a travelling cyclist I need to know if I am going to be able to take a particular road or not before I get there. I know bicycles are not permitted on motorways/autobahns/autovias etc so I suspect that it is implied that bicycle=no on roads designated as such on the Map. But sometimes, you can be travelling along a normal main road - a road=primary or road=trunk for example and suddenly you'll come across a sign like this:
http://www.flickr.com/photos/67276...@n00/4147702071/ and then find yourself having to re-route your journey adding another 20, 30, 40km - not nice to find out just as it's getting dark. I've yet to see a paper map that will give you this information, so bicycle=no in the legal sense on OSM is very important to me. Just my 2p...
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