Final answer:
Passing to the right of a tractor-trailer can be unsafe because the truck driver may not see you while turning right.
Step-by-step explanation:
Yes, it is unsafe to pass to the right of a tractor-trailer because the truck driver may be turning right and not see you. When a truck is making a right turn, it needs extra space and may swing wide to complete the turn. This can create a blind spot on the right side of the truck, making it difficult for the driver to see any vehicles passing on that side.
For example, imagine a car passing on the right of a tractor-trailer that is about to make a right turn. If the truck driver does not see the car, they may turn right and collide with the car, causing a potential accident.
To ensure safety on the road, it is important to always pass on the left side of a tractor-trailer or any larger vehicle, especially if they are signaling a right turn.