West Virginia Code Chapter 17C. Traffic Regulations and Laws of the Road § 17C-13A-2. Restrictions on idling

No driver or owner of a diesel-powered motor vehicle with a gross vehicle weight of ten thousand one pounds or more engaged in commerce may cause, and no owner or operator of the location where the vehicle loads, unloads or parks, may allow the engine of the vehicle to idle for more than fifteen minutes in any continuous sixty-minute period, except as provided under section three of this article.