When I worked the south Seattle freeway in the 80s, truck drivers would try and get as close to us as possible to blow off our smokey bear hats. They called it "dusting" a bear. It was a nationwide activity, and I recall a lieutenant back east getting killed by a truck driver trying to "dust" him.
Or the driver fell asleep, or he was swerving to avoid a four wheeler that cut him off, or the driver was stoned/drunk, or playing with his radio or computer, ad infinitum ad nauseum.
I want to try and pit a semi.