Discount nstruction ground polyethylene access boards . 3/4 Inch ground access mats 100 tons load capacity 22 in green ground access mats 100 T load capacity-HDPE 4×8 Liberty Mat, black, 77lbs, 4′ x 8′ x .5″. virtually eliminate damage to lawns and landscaped areas and provide traction for vehicles operating in mud or sand. ‘ heavy-duty, half-inch thick, 100 percent polyethylene mats