LowPro 23/05 Road Plate System - OKAY Plastics. The LowPro 23/05 is a heavy-duty plastic road plate, suitable to securely and safely ver trenches on highways and sidewalks. Find out more about the LowPro 23/05 with the Product Sheet or read the Trench ver & Road Plates Guide to find out which trench ver is right for your work. pdf. Product Sheet.