La. Roads, Bridges and Ferries § 48:228
The department shall divide the roads comprising the state highway system into fourteen functional classifications, as provided in R.S. 48:191, and shall establish current standards for their functional classification. It shall undertake a continuing study of the needs of the various highways for the purpose of bringing existing highways up to current standards or for replacement of existing highways where required, and shall keep the information so developed up-to-date through a continuing annual needs study. The department shall provide the legislature with an estimate of present day costs of bringing the various highways up to the standard of the functional classification to which each highway is assigned
La. Roads, Bridges and Ferries § 48:228