Ключевые слова: 20 kmh, accident prevention, ahead, attention, car, caution, danger, drive, driving, environment, hazard, highway, icon, information, journey, landscape, limit, message, miles per hour, nature, nobody, outdoors, post, regulation, road, road humps, road sign, roadsign, round, rural, safety, sign, sign post, signboard, sky, speed, speedlimit, street, symbol, traffic, traffic management, transport, travel, trees, triangle, trip, vehicles, warning, way, zone,