Come up on I275W from behind in middle lane at 90+mph slams on his brake right behind the guy next to me then weaves into fast lane where I'm at just inches from my front bumper. I honk horn in protest and he/she throws out his cigar at my car. Then speeds up again and weaves into slow lane going 90+ mph. Any closer and he would have clipped my front end, pushing me into the concrete wall.