Discription of Events: In morning traffic getting on the Bay Bridge 10/1/15, this guy purposely blocked me from merging into lane, nearly hitting me and causing me to have to turn evasively into the shoulder. Then swerved into other lanes and sped up/hit brakes erratically, looking at me in his mirror and laughing. Finally sped off into the empty carpool lane despite the fact he was alone in his vehicle.