CE Certified Road sign manufactured in Knocktopher, Kilkenny. CE certification is a required standard for Road Signs in the EU since 2013. National Roads- Unlit Area: RA1 if AADT<3500, RA2 if AADT is >3500. Lit Area: RA2. Regional Roads- Unlit Area:RA1. Lit Area: RA2. Local Roads- Unlit and Lit Area: RA1. Roadworks- Unlit and Lit Area: RA2. Airport signs may be used to show the route to an airport. The main feature for airport signs is the black on white aircraft symbol, Symbol F 14. The symbol is on a tile 10 stroke widths high. Repeater signs, if required on long stretches of road, will display just the Airport Repeater sign, Sign F 220.