A curbing system provides an outer shell constructed of a durable synthetic material. The shell has at least a base and a pair of sidewalls that extend upwardly from the base. A securing medium interconnects the base with a ground surface and a rigid filler material is contained within the enclosure defined by the base and sidewalls. The filler can be a hardenable filler that changes state from a liquid phase to a solid phase subsequent to pouring. A variety of accessories can be located on the curbing including signs, placards and color coded strips.