Senate Bill No. SLS 26RS-87 designates Interstate 49 in Louisiana as the "Senator J. Bennett Johnston Jr. Memorial Highway." The bill outlines that this designation will cover the entirety of Interstate 49, starting from its intersection with Interstate 10 in Lafayette Parish and extending northward. The Department of Transportation and Development (DOTD) is tasked with erecting and maintaining appropriate signage for this designation, contingent upon receiving local or private funding that matches the department's actual costs for materials and installation, with a cap of $2,250 per sign.

Additionally, the bill ensures that the designation of "Senator J. Bennett Johnston Jr. Memorial Highway" will not lead to the repeal or replacement of any existing state highway designations along Interstate 49. It explicitly states that current designations will remain in effect unless future legislation is enacted to mandate their removal. The effective date for this bill is set for August 1, 2026.