Only the roadbed and the skeletons of the trestles that once crossed streams and mudflats remain.

NPR: Environmentalist John Francis, Walking the Walk

Because a structural spine runs under the middle of the roadbed, the designers could attach the cable fans to the spine in a single row, rather than securing a double set of cables to beams at either edge of the road.

WSJ: A Concrete Ribbon Through the Clouds | Millau Viaduct | Masterpiece by Joseph Giovannini