La. Stat. tit. 33 § 115
The parish or municipality, as the case may be, shall not accept, lay out, open, improve, grade, pave, curb, or light any street, or lay or authorize water mains or sewers or connections to be laid in any street, within any portion of territory for which a planning commission has adopted a major street plan, unless the street has been accepted or opened as or has otherwise received the legal status of a public street prior to the adoption of such plan, or unless the street corresponds with a street shown on the official master plan or with a street on a subdivision plat approved by a planning commission or with a street on a street plat made by and adopted by a commission, copies of which plat have been duly filed as provided in R.S. 33:108. The local legislative body may, however, accept any street not shown on or not corresponding with a street on the official master plan or on an approved subdivision plat or an approved street plat, if the ordinance or other measure accepting such street is first submitted to the planning commission for its approval and, if approved by the commission, is enacted or passed by not less than a majority of the entire membership of the local legislative body or, if disapproved by the commission, is enacted or passed by not less than two-thirds of the entire membership of the local legislative body. A street approved by a planning commission upon submission by the local legislative body, or a street accepted by a two-thirds vote after disapproval by the planning commission, shall thereupon have the status of an approved street as fully as though it had been originally shown on the official master plan or on a subdivision plat approved by the commission or had been originally platted by the commission.
La. R.S. § 33:115