The Capital Airport 2nd Expressway (), officially numbered S51, is a toll expressway that connects eastern Beijing with Terminal 3 of Beijing Capital International Airport.北京市省级高速公路命名和编号 It opened on February 29, 2008, just prior to the 2008 Beijing Olympics. It runs for 11.5 km from Yaojiayuan Road in Chaoyang District to Terminal 3. It was built to serve the Terminal 3, and to reduce pressure of Capital Airport Expressway, which has been heavily congested.
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