What is "semitrailers"

Usage examples of "semitrailers".

Then, rounding the last turn before home, he was stopped by the startling chaos before him that blocked the road and transformed his dull backwater neighborhood into the scene of a natural disaster: there were trucks and cars and monster RVs and a couple of open semitrailers and a ragtag army of intent good-looking people of all ages in baggy shorts and baseball caps, many clutching hand walkie-talkies as if the hard gray rectangles were bricks of precious metal, all moving earnestly among the tables loaded with good-looking food, the folding chairs, the cables, the light stands, with a self-important arrogance, an air of imperviousness, of brute inevitability, because, goddamn it, they were members of a goddamn movie crew.