Notwithstanding any other provision of this article, any government-owned law-enforcement vehicle may be equipped with clear auxiliary lights of a type approved by the Superintendent. Such lights may be used to light emergency scenes and other areas for the purpose of detecting offenders, apprehending violators of law, and in performing other reasonably necessary law-enforcement functions. Such lights may be used when the vehicle on which they are mounted is standing or proceeding at a speed of no more than fifteen miles per hour. Such lights shall not be used in a manner which may blind or interfere with the vision of the operators of approaching vehicles. Any law-enforcement officer may also use spotlights, as authorized in § 46.2-1019, for the purpose and in the manner described herein.