Discription of Events: I was behind him on Karcher and he was going 40 in a 55, I had a line of people behind me so at the next light i tried to pass, he then zoomed up to about 75mph in order to not let anyone pass then continued to slow back down to 40 once we were all behind him again. We ended up turning on the same road and he again went way slower than the speed limit so I tried to legally pass, he then zooms up and comes into the other lane trying to run me off the road, i got in front of him and he then came right up to the back of my car and proceeded to try and sideswipe me while passing me causing me to drive half off the road, he got in front off me and then SLAMMED his brakes trying to make me hit him and then proceeded to drive away going way faster then the speed limit and left my sight. Looked younger like teen/ early 20s. stay safe