Not that the truck driver could be at fault or has no fault in the process. However.
1. The truck is really big! It isn't like a motorcycle or a small car. The size alone demands attention.
2. Limited visibility. If you can't see the truck's mirrors the truck can't see you.
3. Longer breaking. So your car is about 1 or 2 tons. The Truck is hundred times heavier. Momentum reduces the braking ability.
Experience on the road creates expected actions. A truck isn't going to be stuck at an intersection for a half an hour until traffic dies down. He will cut in front of car figuring they are going to slow down, because you really don't want to crash into a 200 ton truck. The autopilot feature doesn't have experience or a will to survive. It just sees it as an unexpected action.