Red Mountain Pass, between Silverton and Ouray, Colorado. The highway was partially closed for months due to rock falls.
When these photos were taken in early June, 2014, the road was only open before 8:30 am, for an hour or so at midday, and after 6:30 pm. The line of cars is waiting to go north toward Ouray.
A few days later, the rock work was completed and the road was open to traffic all day.