La. Stat. tit. 32 § 1602
Current with changes from the 2024 Legislative Session
It shall be unlawful to operate any hydrocarbon gas powered motor vehicle, registered in Louisiana, with a concealed tank for the fuel, upon any public highway or street in this state, which does not have conspicuously displayed, a placard stating that the motor vehicle is powered by hydrocarbon gas.
La. R.S. § 32:1602