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
Richmond Bridge, London Goose", the £3,500,000 yacht of National Car Parks founder Sir Donald Gosling, became wedged under the central arch of the bridge, eventually being freed at low tide the next day. The eighth Thames bridge to be built in what is now Greater London, Richmond Bridge is currently the oldest surviving bridge over the Thames in Greater London, and the oldest Thames bridge between the sea and Abingdon Bridge in Oxfordshire. Richmond Bridge was Grade I listed in 1952 and it is the only Georgian bridge over the Thames in London. Its bicentenary was celebrated on 7 May 1977; the commemoration