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
Black Suspension Bridge file, 42 Havasupai tribesmen carried the one-ton, 550-foot suspension cables. Black Suspension Bridge The Black Suspension Bridge also known as the Kaibab Suspension Bridge spans the Colorado River in the inner canyon of Grand Canyon National Park. It is part of the South Kaibab Trail and is the river crossing used by mules going to Phantom Ranch. The Black Bridge and Silver Bridge, located about 700 meters downstream, are the only spans in hundreds of river miles. The Black Bridge was built in 1928. As motorized vehicles could not access the construction site, humans and mules transported the 122 tons