alert appropriate-behavior appropriate-behaviour area cigarettes communicating communication danger direction environment health health-risk no-smoking not-allowed not-permitted permission-denied pollution prohibited prohibition sign unhealthy warning advice behave behavior behaviour black communicate directions inform information informing message red restricted restriction restrictions signage expectorate expectorating historic-sign no-spitting old railway-platform spit spitting appreciated symbols thanks white black-&-white gray grey greyscale access denied arch arched back-alley bricked in brickwork building city closed corrugated corrugated iron corrugations curved dark decay demolished deterioration disrepair doorstep doorways elements entrance exit exterior external grime ground-level nailed neglect no access partially demolished building safety sealed urban decay canine clean clean-up cleanliness control controlled denial denied dog doggy-do dogs-prohibited droppings exception excrement excreta hygiene lead leash mess messy pets pickup poo prepared regulations responsible rules sanitation waste allowed announcement care careful consideration dogs guidelines pedestrians permission-granted purple risk risks signs track walk walkers walking welcome attention banned blue boundaries boundary directive distance distinctive limits location painted shopping-center shopping-centre symbol wording words birds caution ducks fatal feed feeding food no-bread water-birds watrer-fowl penalties penalty thick thin