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In Canada, a Turnpike Double is two 53 ft (16.2 m) trailers, and a Rocky Mountain Double is a 50 ft (15.2 m) trailer with a 24 ft (7.3 m) "pup". [ 30 ] [ 31 ] [ 32 ] The US federal government, which only regulates the Interstate Highway System , does not set maximum length requirements (except on auto and boat transporters), only minimums.
In Europe this is known as an A-frame drawbar trailer, and in Australia it is known as a dog trailer. Commercial freight trailers are produced to length and width specifications defined by the country of operation. In America this is 96 or 102 in (2.4 or 2.6 m) wide and 35 or 40 ft (11 or 12 m) long.
In North America, the length is commonly 48 or 53 feet (14.63 or 16.15 m), and the width is either 96 or 192 inches (2.44 or 4.88 m) (including rub rails and stake pockets on the sides, which generally placed every 2 feet or 61 cm). Some older trailers still in service are only 45 feet (13.72 m) or shorter if used in sets of doubles or triples ...
The typical 5-axle tractor-trailer combination, also called a "semi" or "18-wheeler", is a Class 8 vehicle. [30] Standard trailers vary in length from 8 ft (2.4 m) containers to 57 ft (17 m) van trailers, with the most common length being the 53 ft (16 m) trailer. [31] Specialized trailers for oversized loads can be considerably longer.
A longer TOFC (trailer on flat car) is usually an 89 ft (27.13 m) car. In the past, these carried three 30 ft (9.14 m) trailers which are, as of 2007, almost obsolete, or one large, 53 ft (16.15 m), two 40-foot (12.19 m) or 45-foot (13.72 m) trailers. As intermodal traffic grows, these dedicated flats are in decline.
The latest skirmish has been over efforts to turn double 28-foot pup trailers into 33-foot pup trailers. Running With Doubles: How North America's Safest Fleet Navigates With 2 53-Foot Trailers ...