advice alert announcement appropriate-behavior appropriate-behaviour area be-careful beware black care careful caution children communicating communication concern danger dangerous directions informing Look looking lookout observance observant red risk risks safety school schools sign signs slow slow-down slower speed time times warning warning-sign watch watch-out white zone advising blue cars hazard hazardous information motorcars orange risky road-sign roadwork signage symbol traffic vehicles words work workers workmen arrow attention electricity energy high high voltage industrial lightning pictogram power voltage yellow barrier colors colours sign. electric fence wires deer ice road rural snow triangle camp-fire fire flame hexagon security rail railway track transport german germany Greek Multilingual ocher russian turkish denied disapproval disapproved no-standing not-allowed not-permitted permission-denied prohibited prohibition prohibitions protect protection restricted restrictions roadside rules sun-rays sunlight sunlit symbols canal communicate design drown graphic icon info lake pond pool river water