Final answer:
When passing parked cars with a driver in one of them, exercise caution and follow traffic rules for safety.
Step-by-step explanation:
When passing a row of parked cars and you see a driver in one of the parked vehicles, you should exercise caution and proceed with care. It is important to prioritize safety and follow traffic rules. You should slow down, keep a safe distance from the parked cars, and be prepared for any unexpected actions by the driver, such as opening their door or pulling out into the traffic.