Siyuan Bridge (simplified Chinese: 四元桥; traditional Chinese: 四元橋; pinyin: Sìyuán Qiáo) is a large, complex overpass in northeastern Beijing, China.
Similar to Wuyuan Bridge further north and Sanyuan Bridge further south, it links three roads instead of just two for a normal overpass. The Airport Expressway, China National Highway 101, and the 4th Ring Road are linked.
Siyuan Bridge is extremely complex. Approaching east (coming in from the west), one faces two exits within a few metres of each other, and the second exit splits into two on the bridge. Half a kilometre away lies yet another exit. The exits for the portion coming in from the east are even more complex (three separate exits), and there is no entrance into the Airport Expressway heading south. Odder still, drivers heading for Beijing Capital International Airport can only enter the 4th Ring Road heading west, but those coming into central Beijing can pick both directions
Whether to Siyuan bridge from which direction, it like a rainbow hanging in the sky, 20 ramps, 10 Zadao Bridge like a roller coaster track huge hover in mid air, looking down from the sky, like from the craft artisans side of a giant bamboo or rattan art, design modeling this bridge is solemn, magnificent momentum, traffic function, all kinds of the direction of the car driving by a special lane, in addition to 10 Zadao Bridge, 8 bridge, due to dam the river a tributary and Jingshunlu line, so they designed the 8 rivers crossing bridges, a total of Siyuan bridge is composed of 26 bridges covers an area of about 500000 square meters.