GLOSSARY
Tractor-trailer
A tractor-trailer is the combination of a heavy-duty truck and a semi-trailer where the trailer is attached to the tractor's fifth-wheel.
What is Tractor-trailer？
A tractor-trailer is the combination of a heavy-duty truck and a semi-trailer where the trailer is attached to the tractor's fifth-wheel.
Some trucks are a solid unit, such as a van, but many have three main units. The front section where the driver sits is called the cab or the tractor (because it pulls a load). Cargo is loaded into the metal box (container), which is loaded onto the wheel base called a chassis or a trailer. These big trucks are often also called 18-wheelers.
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