alert appropriate behavior appropriate behaviour assistance black care concern danger dangerous directions emergencies emergency emergency action first aid help jellyfish jellyfish stings protect protection safety sign signs stingers stings warning warning sign yellow advice approved blue boat-ramp boating boats communicating communication conditions directing direction directional helpful indication indicator information informative informing ramp risk risky river symbol symbols water waterside white words animal announcement careful caution control dog dogs lead leash pet pets restrain restrained restricted restriction rules denied law legalities not allowed not permitted permission denied prohibited prohibition red be-careful beware blocked blocked-path detour go-around lookout observant observe pedestrians security watch watch-out avoid bright appropriate-behavior appropriate-behaviour dangers no-diving not-allowed not-permitted permission-denied risks shallow swimmers swimming wet vehicle apocalyptic appearance bare bleak branches clouds cold contrast Crows dark dark clouds darkening darkness dismal doom gloom gloomy gray grey grim light pain silhouettes skies storm clouds stormy unappealing wintery wintry