La. Roads, Bridges and Ferries § 48:1252
The purpose of this Chapter is to facilitate vehicular traffic, diminish the present handicaps and hazards and promote safety on the congested highways in Louisiana and to make possible the construction of modern express highways, and to carry out said purpose the Louisiana Expressway Authority (hereinafter created) is hereby authorized and empowered to construct, maintain, repair and operate expressway projects (as hereinafter defined) at such locations as may be approved by the department of highways and the Governor, and to issue expressway revenue bonds of said authority, payable solely from revenues, to pay the cost of such projects. It is the further purpose of this Chapter to prohibit the construction, maintenance, repair or operation of any toll expressway project by any subdivision of the government of the state of Louisiana, or any combination of such subdivisions, subsequent to the enactment of this law, except upon specific authorization by the Louisiana Expressway Authority of the state of Louisiana; provided nothing herein shall affect the status of toll bridges, causeways, expressways, tunnels or similar projects heretofore specifically authorized by law or the Constitution or which may be constructed by any authority organized pursuant to R.S. 48:1091-48:1107; provided, further, nothing herein shall affect the inherent constitutional and statutory authority vested in the parishes of Jefferson and St. Tammany, individually or in concert, to construct the Greater New Orleans Expressway as heretofore or hereafter authorized by said parishes, the right of said parishes to construct the Greater New Orleans Expressway being hereby expressly reserved; and provided further that nothing in this Section shall affect or be applicable to the highway project between U.S. Highway No. 61 near Lutcher or Gramercy and U.S. Highway No. 90 at Lafayette as described in the agreement executed as of September 1, 1953, by and between the Department of Highways of the state of Louisiana and the parishes of Ascension, Iberville, Lafayette, St. James, and St. Martin.
La. Roads, Bridges and Ferries § 48:1252