Ключевые слова: access, accident, attention, backdrop, background, banner, barricade, barrier, black, border, care, caution, construction, coronavirus, covid, covid19, cross, design, diagonal, forbidden, frame, hazard, help, illustration, limit, line, message, outbreak, police, prohibition, protection, quarantine, repeat, restricted, ribbon, risk, security, sign, space, stain, stop, street, symbol, tape, warning, white, yellow, yellow caution, zone,