Ключевые слова: asphalt, bicycle, bicycling, bike, biking, city, cycle, day, direction, ecological, environment, exercise, gray, green, ground, health, lane, line, marks, outdoor, outside, park, pathway, pavement, ride, road, roadsign, route, safe, safety, sidewalk, sign, signal, sport, street, symbol, town, track, traffic, transport, transportation, travel, urban, walk, way, wheels, white,