Miss. Code Ann. § 65-1-70

The Mississippi State Highway Department is authorized to construct protective devices or warning devices at or in the vicinity of any railroad crossing of a public highway under the jurisdiction of any county or incorporated municipality, based upon a showing of need resulting from a multidisciplinary study, whenever federal funds are available for such construction. The department is further authorized to supply, out of any available funds in the State Highway Fund, a maximum of one percent (1%) of the funds required for such construction if the county or incorporated municipality in which the construction will be performed complies with the necessary conditions for receipt of the balance of federal matching funds for such construction.