Discription of Events: I added an "A" to the license plate by mistake in my original post. The driver sped past us (we were doing 47 in a 40 zone, and this guy was doing close to 60) after almost rear ending us, merged back into the lane too quickly almost scraping our front end, then stuck his entire arm out of the window to flip us off. He had a Guy Fawks mask on the back of the driver head rest, and what looked like a dummy of some kind in his passenger seat (it had a baseball cap on).