For purposes of this section, "public service vehicle" means a vehicle that is (i) being used to assist motorists or law enforcement officers with wrecked or disabled vehicles, (ii) being used to install, maintain, or restore utility service, including electric, cable, telephone, water, wastewater, communications, and gas, (iii) being used in the collection of refuse, solid waste, or recycling, or (iv) a highway maintenance vehicle owned and operated or contracted by the State or a local government and is operating an amber-colored flashing light authorized by G.S. 20-130.2. Violation of this subsection shall be negligence per se.
N.C. Gen. Stat. § 20-157