Final answer:
If a stationary emergency vehicle has flashing lights, you must slow down and move over if possible to ensure the safety of emergency personnel. When you see a stationary emergency vehicle with flashing lights, the correct course of action is:C. Slow down and move to another lane if possible.
Step-by-step explanation:
When you see a stationary emergency vehicle with flashing lights, the appropriate action to take is to slow down and move to another lane if possible, to allow safe passage for the emergency responders. This is usually required by law and is part of safe driving practices to ensure the safety of emergency personnel attending to a situation. Increasing your speed, honking your horn, or stopping immediately are not preferred actions and could actually create additional hazards on the road. In many places, laws require drivers to slow down and, if possible, move to a lane that is not adjacent to the stationary emergency vehicle. This is to provide a safer environment for emergency personnel who may be working near the roadway. It helps prevent accidents and ensures the safety of both drivers and emergency responders. Always check and follow local traffic laws and regulations regarding this matter, as specific rules may vary by jurisdiction.