Was behind one of their trucks and the truck slowed down and moved to the right of the road and I tried to go around to the left and suddenly, without signaling, the truck darted to the left. I hit the horn and stopped. The guy got out of the car like he wanted to get into it and I told him I hit the horn because it appeared he was stopping on the right side of the road and turned left without signaling. I closed my car door and he kept jawing and got back in, signaled a left turn and went into a driveway where another YMS truck was sitting. 9am in the morning! How about saying, I was not sure where the job was and I suddenly realize where it was and turned left without regard to anyone behind me…