People are stupid.
An old trucker joke:
In a blinding snow storm, a JB Hunt driver rolls up on a plow truck with flashing amber lights. He tells the plow via CB radio that he is just going to follow him. The plow truck answers, “well, ok”. So after a bit a small talk and driving around for an hour or so the plow truck calls to JB on the radio, “ok, JB, let’s go do the next parking lot “.
Those signs are probably necessary
And another bit of trucker wisdom; don’t follow a semi! Mason is close to getting his license and this is something I stress to him all the time. It’s dangerous, particularly so on hot days. Most class A trailers utilize recap tires and those things blow off all the time, launching 50lb hunks of rubber through the air and potentially through your windshield. They should not be legal. If folks had any idea how often they blow they would never follow a truck down the road. There should be a sign for that...