Driver was speeding, tailgating, and gesturing for me to change lanes. I had to turn left for work, so I did so as quickly as I could. I turned off, and he made an illegal u-turn to block me from continuing onto the street from the intersection. I drove around his truck, and he followed me to my office, tailgating and driving recklessly past a group of children waiting for a school bus. He kept driving past my office several times before finally going away.