This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Colorado. Interstate through Glenwood Canyon east of the twin tunnels Own ErgoSum Interstate in Glenwood Canyon Road bridges in Colorado Girder bridges in Colorado Concrete bridges in the United States Viaducts in Colorado Interstate Highway bridges Box girder bridges Concrete road bridges in the United States Prestressed concrete