Here you can find the source code of the BTM (bicycle tags map), rendering OSM bicycle related tags that are not rendered on OSM’s 'Mapnik' or cyclemap version. The map is developed by Noordfiets, PeeWee32 and ligfietser.
The main URL for the Bicycle Tags Map is http://mijndev.openstreetmap.nl/~ligfietser/fiets/ There is also a mirror on http://ftp.nluug.nl/pub/maps/openfietsmap/BTM/index.html
http://wiki.openstreetmap.org/wiki/Bicycle_tags_map
For questions, suggestions etc use this topic on the Dutch OSM forum: http://forum.openstreetmap.org/viewtopic.php?id=18951