advice alert appropriate-behavior appropriate-behaviour background black care caution close-up colors colours communication concern danger dangerous directions distinctive external greenery hazard hazardous hazardous-pathway message path-warning-sign safety shade shadows sign signage sunlight tree trees trip-warning tripping-up uneven vegetation walking-hazard warning warning-sign yellow bilingual board cliff close closeup english erosion fall falling free french graphic green icon image information object photo photograph pictogram pictograph picture post red resource signal slip slippery slipping somadjinn stock symbol texture trip tripping UP white beware drop gray grey rock rocky signboard stone triangle