If an emergency vehicle with flashing lights or sounding a siren approaches you from either direction, you must

Authorized emergency vehicles such as police cars, ambulances, and fire engines have the right-of-way when they are signaling audibly (siren) or visually (flashing lights). When an emergency vehicle approaches you with its flashing lights or siren on, you must pull over to the right edge of the road no matter which direction the emergency vehicle is traveling in. However, if you're in the middle of an intersection when the emergency vehicle approaches, proceed through the intersection and then pull over immediately.