or it could have been these subsections...

(4) Official traffic-control devices may be erected directing specified traffic, including but not limited to buses or trucks, to use a designated lane or designating those lanes to be used by traffic moving in a particular direction regardless of the center of the roadway, and drivers of vehicles shall obey the directions of every such device; and

(5) Official traffic-control devices may be installed prohibiting the changing of lanes on sections of roadway, and drivers of vehicles shall obey the directions of every such device.
Without seeing a street view, interpretation may be difficult.