W. Va. Code § 17-16D-8: Placement of electronic toll collection devices.

An electronic toll collection device that is properly affixed to the front windshield of a vehicle in accordance with rules promulgated by the Parkways Authority, or is mounted elsewhere on a vehicle in accordance with mounting instructions of the manufacturer of the device included with the device, or is otherwise used in a manner that makes it operate as intended, is not a violation of section thirty-six, article fifteen, chapter seventeen-c of this code.