Ключевые слова: asia, asian, bike, business, busy, city, congested, congestion, cross, crossroad, crowd, cycle, drive, hanoi, helmet, lifestyle, motion, motobike, motor, motorbike, motorcycle, passenger, people, pollution, ride, rider, risk, road, safety, scooter, sidewalk, speed, street, traffic, travel, urban, vehicle, vendor, vietnam, vietnamese,