big rig トレーラー

big rig はトレーラーのこと。0:08 the President got behind the wheel of a big rig parked on the White House lawn and had the time of his life.

President Trump Gets Mocked After Getting Behind The Wheel of Truck

https://www.youtube.com/watch?v=KyR0HqlRReU  0:00 a big rig makes a big mess in New Jersey.
Big Rig Slams Into NJ Home

https://www.youtube.com/watch?v=VPQ_0me3GGI  0:55 big rig driver
Relentless Winter Across the Country

https://www.youtube.com/watch?v=yxD0PNGQl_0  0:00 (this) big rig was too tall for an underpass as you see right there in Depew.
Big rig too tall for Depew underpass

参考リンク
http://bridge-english.blogspot.jp/2017/02/semi.html  semi トレーラートラック

練習問題解答
b-4553 big rigs