Whenever an illuminated flashing red or yellow signal is used in a traffic sign or signal it shall require obedience by vehicular traffic as follows:
(a) Flashing Red (Stop Signal). When a red lens is illuminated with rapid intermittent flashes, drivers of vehicles shall stop before entering the nearest crosswalk at an intersection or at a limit line when marked, or, if none, then before entering the intersection and the right to proceed shall be subject to the rules applicable after making a stop at a stop sign.
(b) Flashing Yellow (Caution Signal). When a yellow lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or past such signal only with caution.
Local authorities, in areas that experience low traffic times, may permit flashing signals between the hours of eleven o’clock p.m. and six o’clock a.m.
(WVaC 17C-3-7)
(a) No local authority or person shall place, maintain or display upon or in view of any street or highway any unauthorized traffic control device or traffic control signal, or any unauthorized sign, signal, marking or device which purports to be or is an imitation of or resembles an official traffic control device or railroad sign or signal, or which attempts to direct the movement of traffic or which hides from view or interferes with the effectiveness of any official traffic control device or any railroad sign or signal, and no person shall place or maintain nor shall any public authority permit upon any street or highway any traffic control device bearing thereon any commercial advertising. This shall not be deemed to prohibit the erection upon private property adjacent to a street or highway of signs giving useful directional information and of a type that cannot be mistaken for official signs.
(b) Every such prohibited device, signal, sign or marking is hereby declared to be a public nuisance and the Commissioner of Highways or other authority having jurisdiction over the street or highway is hereby empowered to remove the same or cause it to be removed without notice. (WVaC 17C-3-8)