Certain Department of Military Affairs vehicles and certain Virginia National Guard vehicles designated by the Adjutant General, when used in state active duty to perform particular law-enforcement functions, Department of Corrections vehicles designated by the Director of the Department of Corrections, and law-enforcement vehicles may be equipped with flashing, blinking, or alternating blue, blue and red, blue and white, or red, white, and blue combination warning lights of types approved by the Superintendent. Such warning lights may be of types constructed within turn signal housings or motorcycle headlight housings, subject to approval by the Superintendent. Law-enforcement vehicles may also be equipped with steady-burning blue or red warning lights of types approved by the Superintendent.