Ключевые слова: accident, atom, attention, background, barricade, barrier, black, building, careful, caution, construct, construction, danger, fire, frame, graphic, hand, hazard, hazardous, illustration, line, notice, police, safety, sign, site, space, stop, striped, stripes, tape, traffic, under, urban, wallpaper, warning, weathered, web, yellow, zone,