cool things with wheels, since 2006
Reminds me of the 'pigtail' bridges in the Black Hills of South Dakota, near Mount Rushmore. You can see them on Google maps if you search for 'turtle rock' and then look at route 16A just to the east. Another unique road in the area is the tight tunnel at the Needles (Google map search 'needles eye tunnel'). You should see the tour buses go through there - they have to fold their side mirrors in to fit.
right on! Thanks!