W. Va. Code § 17C-8-5: Local authorities may specify different course for turns.

Local authorities in their respective jurisdictions may cause markers, buttons, or signs to be placed within or adjacent to intersections and thereby require and direct that a different course from that specified in this article be traveled by vehicles turning at an intersection, and when markers, buttons or signs are so placed no driver of a vehicle shall turn a vehicle at an intersection other than as directed and required by such markers, buttons, or signs.