> What about route 40, also known as the National Highway? It basically runs east-west from coast to coast across the entire United States. That would take a substantial amount of time to traverse. And anyway, part of it is closed just beyond Vandalia, Ohio, so you'd have to take the Interstate 70 detour anyway. Boring.
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> Grishny

There is a great deal of nostalgia about some of those old routes. 66, 40, 1, and 41 are among the most popular. They are good highways for people who want to see the real America. It's best to see them in a vintage convertible, or on a Harley, or (why not?)on an old-time motorscooter. You might want to check out the Natchez Trace parkway that begins in Middle Tennessee and goes to Mississsippi. Great for camping or bicycling.
Howard