The invention relates to a cover for use on public roads, comprising an outer body (2) that houses at least one reinforcement (1). Preferably, said outer body (1) is made of a plastic material, e.g. injected plastic material, and said at least one reinforcement (1) is connected by means of said outer body (2) to form a single piece.

The cover according to the invention is lighter than that conventional covers, given that it is made with less metal and with lighter materials. Moreover, the cover cannot be easily recycled and hence is not at risk of theft.

A ground plug for stabilizing a dike, includes a plug front end suitable for being driven into a dike, and an elongate plug body, wherein the plug body is provided with a pressure distributing member arranged to prevent earth flow in a direction perpendicular to a length direction of the plug, and the plug front end includes a recess for receiving a drive member.