alert appropriate-behavior appropriate-behaviour area attention banned boundaries boundary cigarettes communicating communication danger direction directive distinctive entrance environment health health-risk limits location no-smoking not-allowed not-permitted penalties penalty permission-denied pollution prohibited prohibition shopping-center shopping-centre sign symbol thick thin unhealthy warning wording words access-denied access-limited advice ban be-careful beware bylaws concern dangerous denied directions information informing law legal motorbikes-prohibited no-wheels pedestrian-care pedestrian-safety prohibitions restricted restriction restrictions risk risks rules safety signs warning-sign watch watch-out artistic artwork color coloration colored colour coloured conditional conditions contrast copper-art copper-work copperwork coppery craftsmanship decorative designed embossed embossing expressing expression eye-catching impressed indication informative insiders lettering limited-access no-public-access notification notifying patterned patterns perspectives presentation security staff-only workers announcement bicycles-prohibited parking rollerskates-prohibited skateboards-prohibited aware awareness care careful caution colors colours considerate consideration Dirt dirty garbage green limitations limited listen lookout rubbish unwanted waste waste-disposal white behavior behaviour dangers fast freestyle freestyling fun jet-ski jet-skiing manoeuvrability mobility movement outdoors outside pastime power-sport recreation risky river riverside speed sport transport transportation travel water water-sports waterways wave-runners autumn backdrop background calm cirrus cloud clouds cloudy cosmos cumulus dreamy ecological ecology fluffy formation formations free freedon heaven heavens horizon light limit meteorology mood natural nature nimbus outdoor panorama peace peaceful rain road skies sky space speeding spring storm strato-cumulus stratus street summer sunlight sunlit sunny texture tranquil tranquility unrestricted wallpaper weather weirdvis winter administration bumps chaos crazy driver funny glimpse mistake one policemen roadsign roadsigns sleeping way accuracy antigen check checking colloidal coronavirus covid-virus detection diagnosis diagnostic-aid dropper drops home-use immunochromatographic-technology kit lysis-buffer measuring-instrument medical nasal-secretion negative-result plastic quality-control-C-line rapid rectangular result sample sampling-tube self-testing test test-cassette testing