True--Except for the fact that this trucker had a wheelchair and its occupant attached to its grill, and you would have had no idea why it was there, or if there was malicious intent. If you suspect it is malicious and intentional, then it's not a stretch to believe that if you were to pull in front of him, he not only likely wouldn't slow down, but perhaps he'd even take aggressive action to attack you.
It's like the old "Far Side" cartoon, with the caption of "How Mother Nature Says, 'Don't Touch'". There's a picture of hissing cat, a rattlesnake with the rattle shaking, a blowfish with the spikes pointing out, and (punchline) a guy wearing a trenchcoat with a boot on his head, a kid's pool floatie around his waist, and a bazooka under his arm. After reading this story, I would add to that list, a picture of a guy driving an 18 wheeler with a guy in a wheelchair attached to the grill.