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This page was last edited on 19 January 2025, at 03:14 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizontally). In some places, bar gates are installed across suburban streets as a traffic calming measure, preventing through traffic, while allowing authorised vehicles such as emergency services and buses to take advantage of the shorter and more direct route.
This work was created by a government unit (including state, county, city, and municipal government agencies) that derives its powers from the laws of the State of California and is subject to disclosure under the California Public Records Act (Government Code § 6250 et seq.).
California is the only state that retains the nonrectangular U.S. Route shield, which was used nationally until 1961. In 1952, the California Department of Public Works Division of Highways published a Planning Manual of Instructions. A traffic manual was added to the planning manual in 1955. [2]
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.
In 1884, a number of American newspapers reported that the French railway companies were about to adopt an electric gate opener. “A catch connected with an electro-magnet keeps a gate closed,” reported The National Tribune on October 9, 1884. [ 3 ]