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Other People’s Songs: Dana Wheeler-Nicholson’s night job”. Jump to navigation Jump to search “18 wheeler” and “Eighteen wheeler” redirect here. In North America, the combination vehicles made up of a powered truck and one or more semitrailers are known as “semis”, “semitrailers”, “tractor-trailers”, “big rigs”, “semi trucks”, “eighteen-wheelers”, or “semi-tractor trailers”. The most common tractor-cab layout has a forward engine, one steering axle, and two drive axles. Ubiquitous in Europe, but less common in North America since the 1990s, is the cabover engine configuration, where the driver sits next to, or over the engine. The cargo trailer usually has tandem axles at the rear, each of which has dual wheels, or eight tires on the trailer, four per axle. To connect the second of a set of doubles to the first trailer, and to support the front half of the second trailer, a converter gear known as a “dolly” is used.
This has one or two axles, a fifth-wheel coupling for the rear trailer, and a tongue with a ring-hitch coupling for the forward trailer. Future long combination vehicles under consideration and study for the U. MAP-21 transportation bill are container doubles. Tractors can pull two or three trailers if the combination is legal in that state.
Roads other than the Interstates are regulated by the individual states, and laws vary widely. Most states restrict operation of larger tandem trailer setups such as triple units, turnpike doubles and Rocky-Mountain doubles. In Europe usually both rear tractor axles have dual wheels, while single or dual wheels are used for the cargo trailer. The most common combination used in Europe is a semi tractor with three axles, one a lift axle, and a cargo trailer with three axles, one also a lift axle, giving six axles and 22 wheels in total. This format is now common across Europe, due to reduced road-loading requirements, especially for bridges. When using a dolly, which generally has to be equipped with lights and a license plate, rigid trucks can be used to pull semi-trailers. The dolly is equipped with a fifth wheel to which the trailer is coupled.
In order for a 97,000 lb semi-trailer truck to be permitted on UK roads the tractor and semi-trailer must have three or more axles each. Starting in January 2012 the Department for Transport is conducting a trial of longer semi-trailers. This section does not cite any sources. The vehicle was built after Denby Transport believed they had found a legal-loophole in the present UK law to allow the Eco-Link to be used on the public roads. The relevant legislation concerned the 1986 Road Vehicles Construction and Use Regulations. During BTAC performance testing the Eco-Link was given an “excellent” rating for its performance in maneuverability, productivity, safety and emissions tests, superseding ordinary semi-trailer trucks in many respects.
Although the Department for Transport advised that the Eco-Link was not permissible on public roads, Denby Transport gave the Police prior warning of the timing and route of the test drive on the public highway, as well as outlining their position in writing to the Eastern Traffic Area Office. The maximum overall length in the EU and EEA member states was 18. 40 tonnes, or 44 tonnes if carrying an ISO container. What stopped Sweden from adopting the same rules as the rest of Europe, when securing road safety, was the national importance of a competitive forestry industry.