Overhead monotubes
https://www.codot.gov/projects/i70mountain/i-70-westbound-peak-period-shoulder-lane/photo-gallery/overhead-monotubes/view
https://www.codot.gov/projects/i70mountain/i-70-westbound-peak-period-shoulder-lane/photo-gallery/overhead-monotubes/@@download/image/Overhead monotubes_201226.JPG
Overhead monotubes