U.S. Routes as a Subway Map
The latest in my series of transit map-style diagrams - this time, of the U.S. Highway system. That's U.S. Routes (like Route 66), not to be confused with the newer Interstate Highway system (I-5, I20, etc.). Without a doubt, this is the most complex map of this type I have attempted.
As always, comments, suggestions and corrections are gratefully accepted.