Roads, originally intersecting horizontally, are separated in vertical space, so that traffic flow each goes their own way without interfering with each other, hence the overpass.Over time, roads spring up in Changsha, attesting to the heavy traffic and prosperity of the city. In August 1988, in Changsha towered the first overpass in the province, Renmin Road Overpass.Rapid social and economic development plus the soaring cars in number put the city under mounting traffic pressure. As a response, overpasses spring up in Changsha, improving urban road network and easing traffic pressure like an urban “artery”. Apart from facilitating travel, overpasses contributes to the development of the city.Overpass, a visual embodiment of road construction technology, and a card of transportation development achievement, injects impetus for accelerated economic and social growth. Newly built overpasses extend the urban map of Changsha, connect all the corners of the city, and witness the rapid growth of Changsha. Traffic feels like the rhythm of the city, and starlight symbolizes vigorous vitality.