You want to drive straight ahead. What should you do if the [red] truck immediately drives off on “green”?

Your answer is fully correct. When the traffic light turns green and the truck in front of you immediately starts moving, you must wait patiently to allow it to drive off first. This is important because the larger vehicle might need more time and space to start moving safely.

Additionally, giving a warning signal, such as flashing your headlights or gently honking, is allowed if necessary to alert the truck driver, especially if they seem unaware or hesitant. However, you should never start driving immediately yourself in this situation, as it could lead to a collision or confusion.

The general rule is to be patient and give way to vehicles that begin moving ahead of you, especially larger trucks, to ensure safety and smooth traffic flow.