Final answer:
When a transit vehicle has signaled and is merging onto the roadway, you must yield to it to ensure safety.
Step-by-step explanation:
When a transit vehicle such as a bus has signaled and is merging onto the roadway, you must yield to it.
This means that you should slow down and allow the transit vehicle to safely merge into traffic.
By doing so, you are helping to ensure the safety of both the transit vehicle and other road users.