Truck Accident Terms and Definitions

Hazmat Hazardous materials, as classified by the U.S. Environmental Protection Agency (EPA). Transport of hazardous materials is strictly regulated by the U.S. Department of Transportation. Cargo Weight Combined weight of all loads, gear and supplies on a vehicle. Tandem Axle (Tandems) Pair of axles and associated suspension usually located close together. Bobtail Tractor Tractor operating without a trailer. Also refers to straight truck. Bogie (also spelled bogey) Assembly of two or more axles, usually a pair in tandem. Brake Horsepower (bhp) Engine horsepower rating as determined by brake dynamometer testing. (see Horsepower) Cabover (Cab-Over-Engine, COE) Truck or tractor design in which the cab sits over the engine on the chassis. Yard Jockey Person who operates a yard tractor. Kingpin Pin around which a steer axle's wheels pivot. TOFC (Trailer On Flatcar) Method of moving cargo which involves transporting semitrailers on railroad flat cars. Sliding Tandem (Slider) Mechanism that allows a tandem axle suspension to be moved back and forth at the rear of a semitrailer, for the purpose of adjusting the distribution of weight between the axles and fifth wheel. Landing Gear legs which support the front of a semitrailer when it is not coupled to a tractor.

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	Did You Know?
	There Are Exceptions To The Hours-Of-Service Rules. Vehicles used in ground water well-drilling operations, utility service, and transporting construction materials and equipment retain the current 24-hour restart provision. However, these drivers are required to comply with the new 10-hour off-duty and 11-hour driving limitations, as well as the prohibition on driving after the 14th hour after coming on duty.