Abstract: A display sign formed into a single unit having an outer first flange that defines a display section integral to a step section. A display panel bisects the outer first flange forming a flange section extending along the periphery of each side of the display panel. The step section has a U-shaped flange depending from the display section and a rectangular flange spaced inwardly the outer flange, below the display section. A rider display panel is mountable on the display section and includes an outer rectangular flange and a display panel extending therewithin. A pair of clamps are attached to the bottom of the rider display and are adapted to fit the first flange of the display section.