That people go cross the road under the flyover, jam in business quarter,plug at the gate of schools when busy time and so on are all hard stick of the city .

• 天桥下行人横穿马路，商业区汽车拥堵，中小学门口上下学期间人流堵塞，早期修建的桥梁车道数少成为道路瓶颈路段等。