Miss. Code Ann. § 63-5-21

The length limitations provided in Section 63-5-19 shall not apply to vehicles operated at nighttime by a public utility transporting poles, pipes, machinery or other objects of a structural nature which cannot readily be dismembered when required for emergency repair of public service facilities or properties. However, in respect to such night transportation every such vehicle and the load thereon shall be equipped with a sufficient number of clearance lamps on both sides and marker lamps upon the extreme ends of any projecting load to clearly mark the dimensions of such load.