It's a "semi" trailer because it doesn't have its own engine, front axles and wheels, transmission, and so on. Thus, "semi-truck" is a nickname for a truck that carries a semi-trailer.
SEMI meaning: 1 : 54114; 2 : 3 / ˈsɛˌmaɪ/ US : a short, heavy truck that has a long trailer attached to the back and that is used to move goods : semitrailer
Buc-ee's long-standing ban on semi-trucks is drawing renewed criticism after a trucker alleged the policy now includes all commercial trailers. The travel center chain has not confirmed the change, ...
An Amtrak train on the Mardi Gras route heading from Mobile to New Orleans collided with a semi-truck trailer south of Mobile Sunday morning, injuring several crew members and causing travel delays, ...
9NEWS: Driver shares story of how semi truck ended up on his trailer while driving on I-70
Driver shares story of how semi truck ended up on his trailer while driving on I-70
MSN: Giant BJ and the Bear RC semi truck trailer build and test run
Giant BJ and the Bear RC semi truck trailer build and test run Posted: | Last updated: Watch the full build and test run of a giant BJ and The Bear RC semi truck ...
Giant BJ and the Bear RC semi truck trailer build and test run
autoevolution: This 1985 Ford LTL 9000 Semi Truck and Trailer Is Actually a Go-Kart
Built by F.W. Leisure Industries of Tempe, Arizona, this Ford LTL 900 semi-truck might look like the real thing if framed correctly, but is actually just a go-kart. It comes with an open trailer, and ...