Taginfo[1] provides statistics on tags in use and there's a huge amount of documentation for tags (differences between tags, how to use them in certain situatio

Taginfo[1] provides statistics on tags in use and there's a huge amount of documentation for tags (differences between tags, how to use them in certain situations, etc) in the wiki. As an example, the page for highway tags[2] is quite rich. [1] https://taginfo.openstreetmap.org https://taginfo.openstreetmap.org [2] http://wiki.openstreetmap.org/wiki/Key:highway http://wiki.openstreetmap.org/wiki/Key:highway