Virginia Code Title 46.2. Motor Vehicles § 46.2-1061. Sirens or exhaust whistles on emergency vehicles

Every law-enforcement vehicle, every vehicle authorized to be equipped with warning lights pursuant to §§ 46.2-1022 and 46.2-1023 shall be equipped with a siren, exhaust whistle, or air horn designed to give automatically intermittent signals. Such devices shall be of types not prohibited by the Superintendent.