Highway 191 that runs from Alpine to Morenci, Arizona, is called the 'least traveled Federal Highway in the USA'. In five hours, I saw ten vehicles, total, going in both directions. Imagine!
The primary reason is that there are 400 corners in 87 miles. Most of the time you cannot drive faster than 20 miles per hour. Fun to do once but not more than that.
In any case, it was a beautiful day and got to take this shot.