Final answer:
You must slow down and yield to the transit bus when it signals to pull back onto the road, as it ensures safety and is often mandated by law.
Step-by-step explanation:
When a transit bus signals to pull back onto the road, the correct course of action is to slow down and yield to the bus, allowing it to merge back into traffic. It is important for the safety of all road users including the passengers of the bus and other vehicle drivers. Moreover, yielding to buses is often required by law and helps to ensure the efficient flow of public transportation.