Following is a map Legend so you can see what is what. This is based on two different layouts in the following order for all highways/lines: traditional - Desktop layout. Then Velo Layout (the classic layout for GPS use). There is also a "race" layout for road/race cycling not shown here. It is based on the velo layout, but shows some less information (leaving out information not needed for race/road cycling).
Quick guide to the colors used for ways and tracks:
Black: Cycleway or paved track.
Grey: usually unpaved way of lesser quality.
Brown: Path - or footway - the smaller the dots/segments of the line - the less even the surface. Thin continuous lines are of unknown qualit</surface.
In general for brown/red/grey ways: If a way is not rated for difficulty - it will be shown as continous line.
for Classification and explications used - scroll down to the end of this page.
The main road types:
The main tracks and pathes:
Other Important Lines
Points of Interest
Restaurants and Shopping
Sport and Tourism
Municipal and other POI
Sport and Public Places:
Natural and Tourism
G1 – tracktype=grade1 See: http://wiki.openstreetmap.org/wiki/Tracktype
Note that I map other keys to tracktype to give a better description. So I simply assume it is as difficult as tracktype=gradeX.
Cr Or Mr — route=bicycle / route=mtb See: http://wiki.openstreetmap.org/wiki/relation:route
Pri=primary / primary_link
Bktrk – cycleway=track
Opp – cycleway=opposite
Opptrk – cycleway=opposite_track