Semi Truck Coloring Page

The "semi" in semi truck is about the trailer, not the truck. A semi-trailer has no front wheels of its own, so its front end rests on the back of the truck pulling it.

That's why a big rig is often called an 18-wheeler. The truck part has 10 wheels and the trailer has 8. The truck up front is called the tractor, even though it never plows a field.