Section 4 of the constitution insists that each of the legislature, at the federal and state levels, must confine itself to its sphere of legislation viz; the items on each of the list. This means, that neither the National Assembly nor the house of the assembly of a state is at liberty to wonder off into the legislative arena of the other, where each of them strays into the legislative field of the other any law or provision which is an off shoot of that legislative invasion, as it where, on the legislative items is unconstitutional, null and void and stands the risk of being so declared by the court.’ See, page 123 of “GUIDELINES TO INTERPRETATION OF NIGERIAN STATUES” BY OBANDE FESTUS OGBUINYA. The National Assembly lacks the authority to empower the commission to operate on State roads or any other road that is not a federal trunk road.
— A.O. Obaseki-Adejumo, JCA. FRSC v Ehikaam (2023) – CA/AS/276/2019