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General Information
Most people taking the CDL exam will drive a combination vehicle regularly. This study guide gives a brief overview of the most important information needed to drive combination vehicles.
A combination vehicle is the combining of a tractor unit with one or more trailers. This is commonly called a “semi” or “semi truck.” The tractor is connected to the trailer(s) with a fifth-wheel and/or a converter dolly.
The fifth wheel allows the combination vehicle to bend in the middle. This complicates set up, driving, dashboard controls, braking, and backing.