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2. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   In the United States trailers ranging in size from single-axle dollies to 6-axle, 13-foot-6-inch-high (4.1 m), 53-foot-long (16.2 m) semi-trailers are commonplace. The latter, when towed as part of a tractor-trailer or "18-wheeler", carries a large percentage of the freight that travels over land in North America.

3. Truck classification - Wikipedia

   en.wikipedia.org/wiki/Truck_classification

   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.

4. Federal Bridge Gross Weight Formula - Wikipedia

   en.wikipedia.org/wiki/Federal_Bridge_Gross...

   2 Calculated values reflect FHWA policy of rounding down when weights fall exactly between 500-pound (227 kg) increments. [4] 3 Tandem axle by definition. [11] 4 Distances between 8 feet (2.44 m) to 8 feet 11 inches (2.72 m) may not be rounded down. [30] 5 __ Maximum legal weight limit based on number of axles. Increased axle lengths beyond ...

5. Oversize load - Wikipedia

   en.wikipedia.org/wiki/Oversize_load

   an axle load of more than 10 tonnes for a single non-driving axle and 11.5 tonnes for a single driving axle; a width of more than 2.9 metres; a rigid length of more than 18.65 metres; Anyone wishing to transport an abnormal load must notify the police, highway authorities and any on-route bridge and structure owners such as Network Rail. [14]

6. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   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.

7. Double-stack rail transport - Wikipedia

   en.wikipedia.org/wiki/Double-stack_rail_transport

   A 20-foot (6.1 m) container is limited to 24 tonnes (26.5 short tons; 23.6 long tons) and two such can fit into a car for a 40-foot (12.2 m) container, or even three if double-stacking [citation needed], but not four unless very high axle load is permitted. The North American railways permit two 53-foot (16.15 m) containers as shown in the ...