We've often discussed whether it's cheaper to build a long trestle structure or a long embankment. Its amazing that an embankment with such steep sides (as shown in the photo) can support a roadway.
I was looking at the book Bridges, Canals, & Tunnels. They showed a 450 ft long timber trestle railroad bridge near Promontory Point, Utah. It was so flimsy that they covered it with earth after it was built. However, I don't think this embankment has a timber structure underneath.
So is this structure a culvert, a tunnel, or a bridge? I would argue that it is a single span, filled spandrel arch bridge built to allow a grade separation between two highways.
Peru's Bridges: Culvert, Tunnel, or Bridge? by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.