Final answer:
Passing a log-haul truck while it's turning is dangerous due to the unpredictability of its movements and potential for wide turns and loose logs.
Step-by-step explanation:
It is not safe to pass a log-haul truck that is turning because the turning process for these large trucks often requires more space than may be apparent. A log-haul truck may need to swing wide or might obscure nearby traffic, thus during a turn, the truck's movements are less predictable and may intrude into neighboring lanes. Additionally, logs may become loose during a turn and pose a hazard. For these reasons, it's important to give these trucks ample space when they are maneuvering.