During the drive to Takakkaw & Twin Falls (both gorgeous) we ran across a new traffic pattern. All vehicles over 7 m(21 ft) were required to back up or down the middle portion of a set of switchbacks since they could not make the turn at the corners. Appropriate yield signs were placed at both ends of the middle section and everyone waited while a 20 passenger tour bus in front of us backed through that section. I love the Miata! The road was posted “No Trailers”. Good Idea!