Miss. Code § 63-5-45
The transportation by truck of perishable commodities of foreign import discharged at any port in the State of Mississippi shall not exceed sixty-four thousand, six hundred fifty (64,650) pounds load weight on vehicles having wheel base dimensions of not less than forty-five (45) feet, nor more than the maximum allowed by law for any weight. However, such weight and requirements with respect thereto shall never exceed federal limitations for the procurement of federal aid for either maintenance or construction of highways. For vehicles covered by this section, the Mississippi Department of Transportation may prescribe by regulation, from time to time, the number of wheels, axles, size and pressure of tires, and speed, and other related requirements when necessary to such vehicles, which it shall find and determine to be most desirable for the protection and safety of the public highways, considering the size and nature of such vehicles, all in accordance with federal requirements. Transportation permitted under this section shall be limited to the use of U.S. Highway 90 West from the City of Gulfport, Harrison County, Mississippi.
Miss. Code § 63-5-45