Miss. Code § 65-1-27
The Mississippi Transportation Commission is hereby authorized and empowered to enter into or ratify cooperative agreements with the various counties and municipalities in any county through which any of the highways on the interstate highway system, the state designated highway system or the state aid road system may traverse for the construction or maintenance, or both, of connections between such systems and county roads or streets of the municipalities, or interconnections between such systems, the cost of the construction and maintenance of such connections to be apportioned between the Transportation Commission and the county or municipality according to the benefits to be derived by each as determined by such agreement or agreements.
The powers conferred by this section are supplemental to the powers of the commission now provided by law.
Miss. Code § 65-1-27