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I have considered doing one for the Lincoln Highway
Wow, the Wikipedia article on the Lincoln Highway is excellent.
http://en.wikipedia.org/wiki/Lincoln_HighwayI'm getting rather off topic re precancelled stamps here, but for those with access to PBS stations, keep your eye out for broadcasts of Ken Burns' excellent program "Horatio's Drive", a documentary about the first American cross-country automobile trip in 1903. A wealthy man made a bet that he could cross the U.S. in less than 90 days, and spent a small fortune attempting to win the bet. Considering there were only 150 miles of paved roads in the nation at the time, it was by no means a sure thing.
http://www.pbs.org/horatio/about/Ryan