Stop sign ahead.  (This sign provides warning of junctions and railway crossings controlled by a stop sign in situations where the stop sign is not clearly visible to approaching drivers from a distance of at least 60 metres on urban roads and 120 metres on rural roads. It may also be used for an educational period of time when a new stop sign has been installed or where it is deemed that this sign would substantially increase safety.)
Traffic Control Devices Manual
New Zealand Transport Agency