Ключевые слова: activity, begin, bicycle, bike, biking, city, cycle, direction, environment, exercise, health, healthy, lane, lifestyle, lines, marks, must, new, outdoor, pathway, popular, recreation, ride, road, roller blade, route, safety, sign, signal, simple, skate board, speed, stop, street, style, symbol, track, traffic, transport, transportation, travel, urban, warning, way, wheels,