North Carolina General Statutes Chapter 20. Motor Vehicles § 20-190.1. Patrol vehicles to have sirens; sounding siren

Every motor vehicle operated on the highways of the State by officers and members of the State Highway Patrol shall be equipped with a siren. Whenever any such officer or member operating any unmarked car shall overtake another vehicle on the highway after sunset of any day and before sunrise for the purpose of stopping the same or apprehending the driver thereof, he shall sound said siren before stopping such other vehicle.