I've also seen them enforce the road rules!
I was stuck in traffic on the PA turnpike, and some pickups were shooting down the shoulder to pass everyone. A truck moved over to straddle the shoulder to stop it.
I was stuck in traffic on the PA turnpike, and some pickups were shooting down the shoulder to pass everyone. A truck moved over to straddle the shoulder to stop it.
And what's worse, truckers often enforce their "rules" that aren't really laws. Like preventing zipper merges, which are proven to improve throughput when they are allowed to happen properly.