This driver was tailgating me while I was already traveling well above the posted speed limit on Route 12 near the Gardner/Westminster line in Massachusetts. The road was one lane, and the driver proceeded to pass me over a double yellow line. During the pass, they appeared to move toward my vehicle as if they were going to hit me. They then got stuck in traffic about two cars ahead of me and repeated the same aggressive behavior. This occurred at approximately 8:20 AM. The vehicle had a New Hampshire license plate, 5529549.