Was at the end of a long do not pass zone with no cars behind me. Car in question was going at least 25 over the speed limit and merged in front of me right as I got to the traffic cones where his lane ended. Didn’t even see them coming. Laid on my horn and they brake checked me… proceeded to switch lanes multiple times between left and right and brake check multiple other people. About 10 minutes later they were directly in front of me again. I had not changed lanes or sped up.