advice alert announcement appropriate-behavior appropriate-behaviour avoid be-careful beware black care caution communicating communication concern contaminated contamination danger dangerous deep denied directions health information informing not-allowed not-permitted permission-denied polluted pollution prohibited prohibition protect protection red risk risks risky rules safety sign signs toxic toxicity unhealthy warning warning-sign water water-pollution water-toxicity white access-limited advising authorised-entry-only authorized-entry-only blue boots clothing construction-site eye-protection feet footwear helmets injury limited-access peotective-equipment protective restricted restriction restrictions unauthorised unauthorized visibility workers workmen careful crossing double-lines island lookout observant pedestrians reflective refuge road road-sign security share sharing small-traffic-island traffic traffic-flow traffic-island walk walkers walking watch watch-out yellow cars cautious conditions large-vehicles look-out road-conditions road-train rural-area semi-trailers signage slow-down speed speed-reduction symbol text trailers transport transportation trucking trucks vehicles words asphalt bollards changes changing circular cloud-formation clouds concrete cones construction curb curbing curbs delineators edging fill footpath infrastructure public-space road-junction road-surface roads roadside roundabout sand slower street street-lighting surface surfaces surfacing T-junction temporary thoroughfare traffic-cones traffic-control trees uneven-surfaces mobile-lighting witches-hats assistance buoyancy circle flotation-device kisby-ring lettering life-preserver life-saving-buoy lifebelt lifebuoy lifering lifesaver message no-lifeguard perry-buoy personal-protective-equipment pool rescue-aid rescue-device ring-buoy safety-device swim swimming swimming-pool access-denied behave behavior behaviour communicate entry-denied entry-prohibited no-access no-entry children climbing closeups