Bridge four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London is different example of a double-decked bridge, with the central section consisting of a low level bascule span and a high level footbridge. A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct. A three-way bridge has three separate spans which meet near the center of the bridge. The bridge appears as a "T" or "Y" when viewed
Albert Bridge, London in 1957 the London County Council proposed replacing Albert Bridge with a more conventional design. A protest campaign led by John Betjeman resulted in the withdrawal of the proposal, but serious concerns about the integrity of the bridge continued. In 1964 an experimental tidal flow scheme was introduced, in which only northbound traffic was permitted to use the bridge in the mornings and southbound traffic in the evenings. The bridge's condition continued to deteriorate however, and in 1970 the Greater London Council (GLC) sought and obtained consent to carry out strengthening work. In April 1972 the bridge was closed for