The Did You Know? blog today features the history, facts and figures about Route 66. It's a pretty good overview, except for this one item:
Route 66 was also the popular truck route because it was mostly flat.
Well, no. I would never describe much of Missouri, parts of eastern Oklahoma, much of New Mexico and Arizona and a good chunk of California as "flat." The reason truck drivers favored Route 66 over, say, U.S. 40 was because the Mother Road's more southern route saw generally milder weather during the winter.
Uhmm just know
Route 66 was also the popular truck route because it was mostly flat.