Use the snow plow. After a couple of rolls they will be off the highway.
One 18 wheeler should make them into blacktop.
Back in the day, at the U of MD, the protesters used to block US Rt 1 every spring. In 1970, a military vehicle collector brought out his M3 Armored Scout Car (WWII vintage), buttoned it up, and drove through the mob a couple of times. Cleared the street worth a treat!
Don’t try this with a conventional car though. I got stuck in the same crowd on the same day when I turned onto Rt 1 from a side street. Took the State Police to extract me and my Ford Falcon, and the rioters did a lot of damage to the Falcon.