alert appropriate-behavior appropriate-behaviour approval approved black bush-reserve care communication concern conservation conserve denied directions inform information informing natural nature not-allowed not-permitted observation observe park permission-denied permitted prohibited prohibition prohibitions protect protection public-park red restrictions rules sign signs warning warning-sign white advice aid availability boost booster communicating distinctive emergencies emergency fire-brigade fire-control fire-hydrant firemen fires help hope hydrant identification indentifying indication indicator informative lettering maintain maintenance nearby notification notifying prepared pressure red-and-white safety surface water water-pressure behave behavior behaviour birds careful caution communicate ducks fatal feed feeding food message no-bread restricted restriction signage water-birds watrer-fowl access airport airport-terminal blue directional-signs doors exit inside interior open open-doors passengers pedestrians travel travellers travelling way-out advising business closed commerce expression letters no-entry not-open shop shop-sign silver wording words access-denied boating boats danger dangerous directing direction helpful risk risks risky rocks rocky shallow symbol symbols waterside yellow background bright colored colorful coloring colors coloured colourful colouring colours contrast contrasting contrasts decoration facetious fading flippant fuzzy paint painted pink pink-painted-wall sarcasm symbolic vehicles wall wallpaper 3-D color coloration colour convenience embossed embossing ladies-and-gents loo personal public public-convenience public-toilet raised rest-rooms sanitation script tactile texture textured textures thick thin toilet toilets wc word aging angles appearance architectural architecture Australia brown corrosion dark darwin decay deterioration elements historic metal old perspectives rough rust rusty seepage storage surfaces tunnel tunnels Underground uneven variations war wearing weathering World-War-2 wwii