Ключевые слова: activities, asphalt, bicycle, bike, biker, biking, city, competition, direction, ecological, ecology, environment, environmental protection, environmentally friendly, ground, hobby, lane, leisure, line, paint, pavement, pedal, race, rider, riding, riding bike, road, route, safety, sign, signal, sport, street, symbol, traffic, transportation, travel, trip, urban, vehicles, way, wheel,