In keeping with the idea of motorcycle specific maps I think that these are worth a look as well. The 2 guys who have put them together have done map books for British Columbia, Washington State and Northern California so far. They are very thorough and are made from weatherproof materials as well. Here is the link to their website
http://www.destinationhighways.com/And here is an example of a poorly scanned copy of their favourite road in B.C.