Since 2008, La DOTD has been replacing the green-and-white state highway markers with a black-and-white version using the same design. The new shields have a black background, white silhouette, black letters and numbers, and no frame outline (see photo below for comparison).
Louisiana Highway X Alternate (LA X Alt.); Louisiana Highway X Business (LA X Bus.); Louisiana Highway X Bypass (LA X Byp.); Louisiana Highway X Spur (LA X Spur); Louisiana Highway X Truck (LA X Truck)
Louisiana Department of Transportation and Development, Highway Inventory Unit (2016). "LRS Conversion Tool". Louisiana Department of Transportation and Development. Retrieved February 7, 2018.