Miss. Code Ann. § 65-1-25: Miss. Code Ann. § 65-1-25

The Mississippi Transportation Commission is hereby authorized and empowered to enter into or ratify agreements with the transportation departments of the adjoining states for the construction or maintenance, or both, of connections on any part of the interstate highway system, state designated highway system or state aid road system at or near the boundaries of the State of Mississippi, the cost of such construction and maintenance to be apportioned between the states according to the benefits to be derived by each of the states as determined by such agreements.

The powers conferred by this section are supplemental to the powers of the commission now provided by law.