Commercial trucks are often referred to as “big rig”, “semi-truck”, or “tractor-trailer”. They are used by businesses to transport goods. Unlike other trucks, however, commercial trucks require a commercial driver’s license to operate and often serve a specific purpose. Examples include eighteen-wheelers, tractor-trailers, tanker trucks, cement trucks, delivery vehicles, and other large freight trucks. The National Highway Traffic Safety Administration refers to them as trucks weighing over 10,000lbs.