According to the video description “this is a time-lapsed sequence over nine miles of driving. Tractor-trailers engage in an unprovoked rolling roadblock at 2mph below the speed limit for nine miles on I-64 east of Mount Vernon, Illinois, including intentional speed adjustments by both drivers to prolong the roadblock and prevent passing. Don’t you hate when this happens? I’m a storm chaser that logs tens of thousands of miles per year, and it happens to me often. I only saved and posted this particular incident due to its duration and the fact that both drivers intentionally started and prolonged the roadblock.”

https://www.youtube.com/watch?v=a52zZra7Ubw

Source:
Dan Robinson