Mapped: How hard it is to get across U.S. cities using only bike lanes (washingtonpost.com)

bike friendliest city I know of: http://www.opencyclemap.org/?zoom=12&lat=48.01122&lon=7.8337...

This is why it's important for cyclists to use the road network. Streets designated as bike routes are actually pretty great: quiet, easy to share, and connected to the road network. Bike lanes are more important on more arterial roads.