Final answer:
The correct action when encountering a farm vehicle on the road is to carefully wait for a safe opportunity to pass it.
Step-by-step explanation:
When encountering a farm vehicle on the road, the correct action to take is to wait for a safe opportunity to pass with caution. It is important to be patient and not to honk the horn, tailgate, or pass the vehicle hastily, especially if it means crossing a solid line. The goal is to ensure safety for all road users, which includes respecting the slower speeds and wider turns that farm vehicles may require.