You see an ambulance approach with its flashing lights on. What must you do?

You must pull over to the right side of the road and stop for any approaching emergency vehicle with its flashing lights engaged. Keep your foot brake engaged so the emergency vehicle driver can see that you have stopped. [Right-of-Way, Chapter VI: Traffic Laws and Rules of the Road, State of West Virginia Driver's Licensing Handbook], [Operation of Vehicles and Streetcars on Approach of Authorized Emergency Vehicles, Section 17C-9-5, West Virginia Code]