For all I know, Main Street in Fredericksburg is the widest in the nation.  It was so broad, I had to make a point of remembering why I was crossing to keep from forgetting by the time I reached the other side.  And it was broad not for a few blocks but for two miles.  Settlers from the compacted villages of the Rhine Valley laid Main out to enable ox carts to turn around in it.  A shopkeeper explained: "We don't say somebody's dumb as an ox anymore because we've forgotten how dumb that is.  We say a guy's a 'dumbass,' although I doubt we know how dumb that is either.  Be that as it may, you can't teach an ox to back up.  You can teach a horse to back up, but forget an ox.  Main Street's wide because an ox is stupid."  

Willam Least Heat-Moon 1983, pp.144-45