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A boom barrier, also known as a boom gate, [1] is a bar, or pole pivoted to allow the boom to block vehicular or pedestrian access through a controlled point. [2] Typically, the tip of a boom gate rises in a vertical arc to a near vertical position. Boom gates, especially manually operated ones, are often counterweighted, [3] so the pole is ...
Whiplash Protection System (WHIPS) is a system to protect against automotive whiplash injuries introduced by Volvo in 1998. [ 1 ] It was launched when the Volvo S80 [ 2 ] was released for the 1999 model year and has since been part of the standard equipment of all new Volvo cars. [ 3 ]
Semi-trailer aerodynamic device. Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence. The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings ...
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Main article: Slip gate. L-shaped grooves to slide in the crossbar. Square concavities to receive the horizontal crossbars. Slip gates are a form of gate which permits people and vehicles through an entrance but which blocks the passage of animals. Branches or worked wood crossbars or stangs were used, one field slip gate pier with L-shaped ...
Roadrailer. RoadRailers were a trailer or semi-trailer that could be hauled on roads by a tractor unit and then by way of a fifth wheel coupling, operate in a unit train on railway lines. The RoadRailer system allowed trailers to be pulled by locomotives without the use of flatcars, instead attaching trailers directly to bogies.
Compressed-hydrogen tube trailer. Hydrogen tube trailers are semi-trailers that consist of 4 to 36 cluster high-pressure hydrogen tanks varying in length from 20 feet (6.10 m) for small tubes to 53 feet (16.15 m) on jumbo tube trailers. They are part of the hydrogen highway [1] and usually precede a local hydrogen station.
Turnstile. A turnstile (also called a gateline, baffle gate, automated gate, turn gate in some regions) is a form of gate which allows one person to pass at a time. A turnstile can be configured to enforce one-way human traffic. In addition, a turnstile can restrict passage only to people who insert a coin, ticket, transit pass, security ...
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