Sometimes it is just your turn in the barrel.
https://screenrant.com/duel-why-truck-driver-identity-never-seen/
In “Duel: A Conversation with Director Steven Spielberg” (available on YouTube), the director hinted that the antagonistic truck driver in Duel was a serial killer. Spielberg said, “The intention was that he was basically a marauder in every state,” and pointed to the various license plates on the front of the truck as evidence of his murderous past. In this sense, the truck driver is a classic slasher movie villain. This ominous visual detail hinted that the trucker had been driving across America, targeting unsuspecting commuters like Mann, and these license plates were taken from vehicles he ran off the road in other states
I was driving through a construction zone on the Pennsylvania turnpike around midnight a few years ago. Suddenly I was being chased by a semi with an empty flatbed. I have absolutely no idea why but I was determined he was not getting next to me.
At one point we were doing about 110. I finally got far enough ahead and away from the guy. It went on for several miles.