Va. Code § 33.2-238
If it appears to the Commissioner of Highways necessary for the safety of the traveling public or for proper completion of work that is being performed to close any highway under his jurisdiction to all traffic or any class of traffic, the Commissioner of Highways may close, or cause to be closed, the whole or any portion of such highway deemed necessary to be excluded from public travel and may exclude all or any class of traffic from such closed portion. While any such highway or portion thereof is so closed, or while any such highway or portion thereof is in process of construction or maintenance, the Commissioner of Highways, or contractor under authority from the Commissioner of Highways, may erect, or cause to be erected, suitable barriers or obstructions thereon, may post, or cause to be posted, conspicuous notices to the effect that the highway or portion thereof is closed and may place warning signs, lights, and lanterns on such highway or portion thereof. When such highway is closed for the safety of the traveling public or in process of construction or maintenance as provided in this section, any person who willfully breaks down, drives into new construction work, removes, injures, or destroys any such barrier or barriers or obstructions, tears down, removes, or destroys any such notices, or extinguishes, removes, injures, or destroys any such warning lights or lanterns so erected, posted, or placed is guilty of a Class 1 misdemeanor.
Va. Code § 33.2-238