One time on hwy 5 (2 lane) I had a guy do this 5 times. Every time I tried to get around him on the right, he would match my speed and box me in only to then ride next to a car on the right. Eventually, got fed up and pushed us up to over 100 MPH before he backed off and let me pass. I figured he'd be on my butt but no, he found another car on the right, slowed down to 65 and continued blocking traffic behind us.