PLATE LOCK is manufactured from a recyclable high density polyethylene material, safety orange in color, ranging in sizes from 4 ft. to 10 ft. lengths. PLATE LOCKS are installed around the perimeter of the trench plate, securing the plate to the roadway. The wedge shape design allows for a smooth transition from the road surface, to the top of the plate, and back to the road surface. The highly visible safety orange color alerts motorists, cyclists and pedestrians of the installed trench plate.