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CDL Tests And General CDL Information
A Commercial Driver's License (CDL) is a driver's license required in the United States to operate any type of vehicle which has a gross vehicle weight rating (GVWR) of 26,001 lb (11,793 kg) or more for commercial use, or transports quantities of hazardous materials that require warning placards under Department of Transportation regulations, or that is designed to transport 16 or more passengers, including the driver. This includes (but is not limited to) tow trucks, tractor trailers, and buses.

Friday, December 17

Truck and Trailer Equipment - Attaching a Semi Trailer to a Road Tractor

Friday, December 17, 2010 Posted by CDL Tests
How is a road tractor connected to a semi-trailer? The attachment between the tractor and the trailer is made by two connecting devices. One is the "fifth wheel" that is mounted on the rear frame of the road tractor. The other is called the "kingpin", which is located on the front end of the truck trailer.
What is a Fifth-Wheel?
Originally, a fifth wheel was a steering mechanism resembling a wheel that enabled the front axle of a horse-drawn wagon to rotate when making turns. Around 1910, John C. Endebrock invented a device for coupling trailers to motor vehicles. In its initial use, trailers were towed by Ford Model "T" passenger cars. Thi

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