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
Add Yahoo as a preferred source to see more of our stories on Google. WACO, Texas (FOX 44) – Forget the highway—the heavy haulers are heading for the showroom floor! The tenth RC Semi Truck Show ...
Julius Perdana on MSN: Smokey and the Bandit DIY RC car and semi truck full build legendary replica project explained
A full DIY build of an RC car and semi truck inspired by Smokey and the Bandit, showcasing the construction process, detailing, and final legendary replica results. #RCCar #DIYBuild #ModelTruck ...
Smokey and the Bandit DIY RC car and semi truck full build legendary replica project explained
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 Watch the full build and test run of a giant BJ and The Bear RC semi truck trailer. See the detailed construction, realistic design, and ...
Giant BJ and the Bear RC semi truck trailer build and test run
KGW on MSN: All lanes open after semi-truck crash on Interstate 5 at Macadam Avenue
A crash involving two semi-trucks closed lanes on the I-5 for several hours.
All lanes open after semi-truck crash on Interstate 5 at Macadam Avenue