The LowPro 15/05 is made of modular plastic road plates, suitable for 44t vehicles, and for carriageways over a 700mm trench. LowPro 15/05 Plastic Road Plate is a direct alternative to 1.25m x 2.4m, 20mm thick steel road plates. Noise dampening. ... Ready to find out more or to get in touch with our sales team? ntact us now. Get in Touch.