Final answer:
One must yield and sometimes stop for vehicles with flashing lights when they are emergency vehicles responding to emergencies, but context dictates the appropriate action for other types of vehicles with flashing lights.
Step-by-step explanation:
When driving, it is required that you yield to vehicles with flashing lights approaching from behind in the same direction. The correct response to the student's question on whether to yield to these vehicles is: Sometimes. This primarily applies to emergency response vehicles such as ambulances, fire trucks, and police cars, which use flashing lights to clear the road when responding to emergencies. In these cases, you must pull over and stop if necessary, to allow these vehicles to pass by safely. However, the context matters, as there may be other vehicles with flashing lights that do not require you to stop or yield, such as a tow truck or similar service vehicle that is stationary while assisting another vehicle on the side of the road.