"There is a road, no simple highway

Between the dawn and the dark of night

If you shoud go, no one may follow

That path is for your steps alone." 

Hunter/Garcia

Other than jpeg pictures all the maps are in Google Earth format (kml, or kmz).  The color code is:

Yellow = paved road

Brown = confirmed big bike road.

Blue = looks like it might be a big bike road but unconfirmed,.

When you download a map set it will be in a zip file and all the contained files will be for google earth.