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. Slippery Road: this sign should be used to warn that the danger of vehicles skidding is greater than normal. The degree of danger cannot be defined as it depends on the skid resistance, speed of traffic, superelevation, weather and other factors. The sign is typically used where traffic is running on a temporary surface or the final surfacing has not yet been laid. Supplementary Plate P 085 Unfinished Surface, and Plate P 011 Cautionary Speed, may be used in conjunction with Sign WK 072. Where roadworks are substantially complete but it is necessary for a road to remain for a period with a surface other than the permanent final surface course, Sign WK 072 should be used. Since this is a roadworks sign with an orange background, it must be preceded by Sign WK 001 even though other TTM is removed.