Humber Bridge July 1981. With a centre span of and a total length of , the Humber Bridge was the longest single-span suspension bridge in the world for 17 years, until Japan's Akashi Kaikyō Bridge opened on 5 April 1998. The road-distance between Hull and Grimsby was reduced by nearly as a consequence of the bridge. The bridge's surface takes the form of a dual carriageway with a lower-level foot and cyclepath on both sides. There is a permanent speed limit on the full length of the bridge. Each tower consists of a pair of hollow vertical concrete columns, each tall and
Otowi Suspension Bridge National Laboratory, which became nationally important during World War II. It was also the only public highway suspension bridge in the state and was the best-rated bridge in the state in a 1987 survey. It was a contributing property in the listing of the Otowi Historic District to the National Register in 1975. Otowi Suspension Bridge The Otowi Suspension Bridge, spanning the Rio Grande River near San Ildefonso, New Mexico, is a wooden suspension bridge built in 1924. It was listed on the National Register of Historic Places in 1997. The bridge has been closed to vehicular traffic since the