2nd Airport Expressway

{{Short description|Toll expressway in Beijing, China}}

{{Expand language|topic=|langcode=zh|date=January 2025}}

{{Infobox road

|country=CHN

|province=Beijing

|state=BJ

|established=2008

|type=S

|route=51

|map=

|length_km=11.5

|length_ref=

|previous_type=S

|previous_route=50

|previous_dab=

|next_type=S

|next_route=66

|next_dab=

|direction_a=

|terminus_a=Yaojiayuan Road in Chaoyang District, Beijing

|junction=

|direction_b=

|terminus_b=Terminal 3 at Beijing Capital International Airport

}}

The 2nd Airport Expressway ({{zh|s=首都机场第二高速公路}}), officially numbered S51, is a toll expressway that connects eastern Beijing with Terminal 3 of Beijing Capital International Airport.[http://www.bjjtw.gov.cn/xxgk/fgbz/jthybzgf/201211/P020121115316344042085.pdf 北京市省级高速公路命名和编号] {{webarchive|url=https://web.archive.org/web/20131213011500/http://www.bjjtw.gov.cn/xxgk/fgbz/jthybzgf/201211/P020121115316344042085.pdf |date=2013-12-13 }} 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 new Terminal 3, and to reduce pressure of Airport Expressway, which has been heavily congested.{{cite web|url=http://jtcx.beijing.cn/ctkc/hk/n214070194.shtml|title=机场第二高速东五环平方桥至T3航站楼|date=2008-06-18|accessdate=2010-08-13|archive-date=2010-10-15|archive-url=https://web.archive.org/web/20101015115424/http://jtcx.beijing.cn/ctkc/hk/n214070194.shtml}} {{webarchive|url=https://web.archive.org/web/20101015115424/http://jtcx.beijing.cn/ctkc/hk/n214070194.shtml}}{{cite web|url=http://politics.people.com.cn/GB/14562/7409390.html|title=北京机场第二高速今日开通 双向共有9个免费出口|date=2008-06-21|accessdate=2010-08-13|archive-url=https://web.archive.org/web/20100911053413/http://politics.people.com.cn/GB/14562/7409390.html|archive-date=2010-09-11}}