Copolymers of ethylene and an acrylic acid or methacrylic acid; vinyls,fluoropolymers, polyethylenes, cellulose acetate butyrate, polycarbonates and polyacrylates are other examples of polymers that can be used for the spacing layers and optional protective layers in the retroreflective sheet of the present invention.The thickness of the spacing layer is dependent upon the index of refraction and