Moderate traffic, many stoplights. I gave a couple of car lengths ahead of myself. The guy was behind me in his truck, and I obviously wasn't driving fast enough for him. He sped past me from the left, although that wasn't a lane and continued to cut me off, then abruptly slammed his brakes (twice), almost causing myself to rear end him and causing the car behind me to hit their brakes and almost rear end me. He was trying to cause an accident. It's very obvious he was out to cause harm to the public.