Why Is a Tractor-Trailer Sometimes Called a 'Semi Truck'?

Semi-trailer truck - Wikipedia

Semi truck eighteen wheeler semi tractor trailer hi-res stock photography and images - Alamy

Fun Facts About Semi-Trucks

Where Did Semi-Trucks Get Their Name?

Semi-trailer truck - Wikipedia

10 Things You Didn't Know About Semitrucks

The Definitive Guide To Semi Trucks

What is a Semi Truck? Why is it Called a Semi Truck?

Why Semi-Trucks Are Deadlier Than Other Vehicles

Types of Trailers Used to Ship Semi Trucks - Heavy Equipment Transport

Hello Truckers, I would like to know the general length of a truck tractors length/how long is a semi truck without trailer. Does it vary depending on state? I know that there

The Various Components of a Semi-Truck