<P> These markings and colours are required by the NFPA (National Fire Protection Agency). </P> <P> In Australia, hydrant signage varies, with several types displayed across the country . Most Australian hydrants are underground, being of a ballcock system (spring hydrant type), and a separate standpipe with a central plunger is used to open the valve . Consequently, hydrant signage is essential, because of their concealed nature . </P> <Ul> <Li> Painted markers--Usually a white or yellow (sometimes reflective paint) triangle or arrow painted on the road, pointing towards the side of the road the hydrant will be found on . These are most common in old areas, or on new roads where more advanced signs have not been installed . These are almost always coupled with a secondary form of signage . </Li> <Li> Hydrant Marker Plates--Found on power poles, fences, or street - signs, these are a comprehensive and effective system of identification . The plate consists of several codes; H (Potable water Hydrant), RH (Recycled / Non Potable), P (Pathway, where the hydrant cover can be found), R (Roadway). The plate is vertically oriented, around 8 cm wide, and 15 cm high . It usually faces in the direction of the hydrant . Found on this plate, from top to bottom, are the following features: <Ul> <Li> The codes listed above, Potable / Non-potable at the top, Path / Roadway on the bottom of the plate . </Li> <Li> Below this, a number giving the distance to the hydrant (in meters), then a second number below that giving the size (in millimeters) of the water main . </Li> <Li> A black line across the center of the plate indicates the hydrant is found on the opposite side of the road to which the plate is affixed . </Li> <Li> Plates for recycled water have a purple background, as well as the RH code, normal potable hydrants are white, with the H code . </Li> </Ul> </Li> <Li> Road markers or Cat's eyes--Almost exclusively blue, these are placed on one side or the other of the centre line of the road, to indicate on which side of the road the hydrant lies . They are visible for several hundred meters at night in heavy rain, further in clear conditions . </Li> </Ul> <Li> Painted markers--Usually a white or yellow (sometimes reflective paint) triangle or arrow painted on the road, pointing towards the side of the road the hydrant will be found on . These are most common in old areas, or on new roads where more advanced signs have not been installed . These are almost always coupled with a secondary form of signage . </Li>

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