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Griswold signals on 22nd Avenue NE, Minneapolis, pictured in 2018. In 1927, Griswold introduced the rotating banner signal. This was a unique combination of highway flasher and rotating stop sign (similar to a school bus stop sign).
20 Jacques Cartier Bridge: 334 (1,096) 1930 Montreal, Quebec, Canada: 21 Shibanpo Yangtze River Bridge: 330 (1,080) 2006 Chongqing, China: 22 Richmond-San Rafael Bridge: 326 (1,070) x2 1956 Richmond, California, United States: 23 John P. Grace Memorial Bridge: 320 (1,050) 1929 (demolished in 2006) Charleston, South Carolina, United States: 24
A cantilever bridge is a bridge built using structures that project horizontally into space, supported on only one end (called cantilevers).For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.
A cantilever in a traditionally timber framed building is called a jetty or forebay. In the southern United States, a historic barn type is the cantilever barn of log construction. Temporary cantilevers are often used in construction. The partially constructed structure creates a cantilever, but the completed structure does not act as a cantilever.
A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
The Governor Malcolm Wilson Tappan Zee Bridge, commonly known as the Tappan Zee Bridge, was a cantilever bridge in the U.S. state of New York.It was built from 1952 to 1955 to cross the Hudson River at one of its widest points, 25 miles (40 km) north of Midtown Manhattan, from South Nyack to Tarrytown.