Truck Accident Terms and Definitions

Fixed Tandem Assembly of two axles and suspension that is attached to the chassis in one place, and cannot be moved fore and aft Cabover (Cab-Over-Engine, COE) Truck or tractor design in which the cab sits over the engine on the chassis. TOFC (Trailer On Flatcar) Method of moving cargo which involves transporting semitrailers on railroad flat cars. 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) 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. PTO (Power Takeoff) Device used to transmit engine power to auxiliary equipment. Landing Gear legs which support the front of a semitrailer when it is not coupled to a tractor. Semitrailer trailer supported at the rear by its own wheels and at the front by a fifth wheel mounted to a tractor or dolly. Tandem Axle (Tandems) Pair of axles and associated suspension usually located close together. Kingpin Pin around which a steer axle's wheels pivot.

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	Did You Know?
	Off-Duty Time At A Yard For Oil-Field Equipment Is Not Excluded From The 14-Hour Calculation. Off-duty time at a yard for oil-field equipment is counted toward the calculation of the 14-hour rule. Only waiting time at a natural gas or oil well site may be excluded from on-duty time.