Ключевые слова: active, activity, background, bell, bicycle, bicycles, bicyclist, bike, bikes, biking, city, conceptual, cycle, cyclist, environment, environmental, equipment, exercise, explore, fitness, fun, group, health, healthy, hip, hipster, hundreds, leiden, leisure, lifestyle, many, mobility, multiple, netherlands, outdoor, pedal, rack, recreation, ride, riding, row, sport, street, style, sustainable, symbol, town, transport, urban, vintage,