Ключевые слова: asphalt, borderline, concept, contagious, corona, coronavirus, covid, covid19, distance, epidemic, feet, floor, health, isolation, limit, line, lockdown, message, outdoor, pandemic, people, person, prevention, protection, public, quarantine, risk, road, safe, safety, shoes, sign, social, social distancing, standing, stay, stop, stop line, street, symbol, text, two, urban, view, virus, warning, way, yellow,