Whenever an illuminated flashing red or yellow signal is used in a traffic sign or signal it requires obedience by vehicular traffic as follows:
(1) 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 is subject to the rules applicable after making a stop at a stop sign.
(2) Flashing yellow (caution signal). — When a yellow lens is illuminated with rapid intermittent flashes, drivers of vehicles may proceed through the intersection or past the signal only with caution.
(3) 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.
Structure West Virginia Code
Chapter 17C. Traffic Regulations and Laws of the Road
Article 3. Traffic Signs, Signals and Markings
§17C-3-1. Adoption of Manual and Specifications for Uniform System of Traffic-Control Devices
§17C-3-2. Placing and Maintaining Traffic-Control Devices and Signs on State Highways
§17C-3-3. Local Traffic-Control Devices
§17C-3-4b. Traffic Violations in Construction Zones; Posting Requirement; Criminal Penalty
§17C-3-5. Traffic-Control Signal Legend
§17C-3-6. Pedestrian Walk and Wait Signals; Penalty
§17C-3-9. Interference With Official Traffic-Control Devices or Railroad Signs or Signals
§17C-3-10. Interference With Official Traffic-Control Devices by Infrared or Electronic Devices