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Road Zipper machine at the Golden Gate Bridge, San Francisco, California. A barrier transfer machine, also known as zipper machine or road zipper, is a type of heavy vehicle that is used to transfer concrete lane dividers, such as Jersey barriers, in order to relieve traffic congestion during rush hours. Many other cities use them temporarily ...
A 'Queue in both lanes' sign orders drivers to use both lanes up to the merge point Zipper method road signage in Warsaw. The late merge method, also known as zipper merging, dictates that both streams of traffic should continue to drive up to the point of closure of one stream and merge at the marked taper.
The road has a total of five lanes, divided by a zipper barrier, which was added to the bridge in 2002, in which a machine can configure the number of lanes in each direction, depending upon traffic volume or construction.
Traffic barrier with a pedestrian guardrail behind it. Traffic barriers (known in North America as guardrails or guard rails, [1] in Britain as crash barriers, [2] and in auto racing as Armco barriers [3]) keep vehicles within their roadway and prevent them from colliding with dangerous obstacles such as boulders, sign supports, trees, bridge abutments, buildings, walls, and large storm drains ...
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A 1956 article in the Asbury Park Press cited a suggestion by the state's top highway planner to add a "jug-handle" on Route 35 to facilitate the flow of traffic. [3] One of the earliest mentions of jughandles in The New York Times is on June 14, 1959, referring to jughandles having been built in New Jersey on U.S. Route 46 in Montville, U.S. Route 22 between North Plainfield and Bound Brook ...
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When a vehicle impacts the high-tension system under normal conditions, the cable deflects as little as 8 ft (2.4 metres) from its original location. The inherent tension within the system also allows the cables to remain strung, even after an impact that removes several posts, thus allowing the remainder of the run to function normally.