Grid plate of plastic material

A grid plate of plastic material, having a rough slippage-preventing top side and a rib-reinforced bottom side, which is adapted to be emplaced as a fastening element for parking places, road embankments, ramps, and the like, comprising:

• a three dimensional grid plate including an upper face, a lower section opposite said upper face, at least three sides around the perimeter extending from said upper face to said lower section, and
• plug-in connecting means adapted to be locked together and again disconnectable for connecting together emplaced grid plates including at least one insertable connecting web means projecting horizontally out of at least two side walls of the grid plate in given positions on a first half region of each side wall and extending out beyond the upper face, said connecting web means each having a free end angularly bent hook-shaped into a half-hinge, and at lease one horizontal wall aperture means being provided in an upper portion of said at least two side walls of the grid plate, which horizontal wall aperture means include connecting web means in positions on a second half region of each side wall for engaging respective insertable connecting web means of adjacently arranged grid plates in said given positions while permitting predetermined relative horizontal movement of the grid plates with respect to one another when in an installed position.