Va. Code Ann. § 46.2-1154

The provisions of § 46.2-1118 shall not apply to vehicles which, because of a mechanical breakdown or an accident, are towed to the nearest repair facility which can furnish the required service. In any such case such connection may consist solely of a chain, rope, or cable of no more than fifteen feet long. A licensed driver shall be at the controls of the towed vehicle to brake, steer and control its lights.