The governing body of any county, city, or town may by ordinance limit to no more than two hours the length of time of parking on streets, adjacent to commercial business areas, of vehicles with gross weights in excess of 12,000 pounds or lengths of 30 feet or more, unless such vehicles are actively engaged in loading or unloading operations or waiting to be loaded or unloaded or are engaged in or preparing to engage in utility or similar service work.
Va. Code § 46.2-1222.2