cigarette cigarettes forbidden sign smoke smoking warning attention bollard building danger road under construction drown drowning lake swimming water beware careful signs train.trains transport warnings advice alert announcement appropriate-behavior appropriate-behaviour be-careful black care caution communicating communication concern crossing dangerous information informing lookout observant pedestrians red risk risks risky road-sign safety security share sharing speed-reduction stop street-sign traffic traffic-flow walk walkers walking warning-sign watch watch-out yellow camera cameras cctv center centre closed-circuit-tv extensive monitoring monitors notice notification observation observe signage surveillance thorough under-observation video watched white construction fence hard hat protection site work daylight daytime directions inform lettering message messages pool poolside protect restricted restrictions rules sheltered-pool symbols text words roadsign shuttle street car town tram tramway appropriate behavior appropriate behaviour be careful cars listen Look looking trams warning sign watch out ban prohibition round swim