Mississippi Code Title 63. Motor Vehicles and Traffic Regulations § 63-5-17

No vehicle unladen or with load shall exceed a height of thirteen feet, six inches. However, no person, firm or corporation, or the State of Mississippi or any subdivision thereof, shall be required to raise, alter, construct or reconstruct any underpass, wire, pole, trestle, or other structure to permit the passage of any vehicle having a height, unladen or with load, in excess of twelve feet, six inches. Full liability for damage to any structure caused by any vehicle having a height in excess of twelve feet, six inches, shall be borne entirely by the motor carrier or operator of the vehicle.