All signs are manufactured in accordance with Chapter 8 of the Traffic Signs Manual Ireland, which outlines the standards in temporary traffic management in Ireland. All Chapter 8 roadworks signs are to be RA2 face material. The chapter specifies the requirements for the use of temporary traffic control measures, such as signs, barriers and cones, in roadworks and other temporary traffic management situations. Lanes Rejoin at Crossover: this sign should be used on a dual carriageway to depict traffic in lane 1 carrying straight on by deviating back to the right and traffic in lane 2 crossing back over the central reserve at the end of a contra-flow.