One Way Sign (For Pedestrians) Post Mounted Diagram 810 R2/RA2This sign serves to inform pedestrians crossing the road that the area is operating a one way system and that traffic may approach from an unusual direction. These are often used in conjunction with look left or look right road markings. This one way sign is made from a long lasting composite backing consisting of plastic sandwiched between two sheets of aluminium. The reflective material of this sign is R2 grade (previously known as RA2) and is