When I started driving (in NJ) in the 60's, there were plenty of roads that were 12 ' wide or less... Out here in Hideho, there are still a goodly number of 'improved' gravel logging roads where , when confronted by a BIG Kenworth log truck, you back up a mile or so to let him by.
In particular, I remember roads west of Morristown, NJ that had radius' that were less than 40'.
Bob in IDaho