The 6th Ring Road () is an expressway ring road in Beijing, China which runs around the city approximately from the center of the city. The 6th Ring Road is approximately long. The road is numbered G4501 and as such is considered a peripheral segment of the G45 Daqing-Guangzhou Expressway. The Sixth Ring Road was opened for regular traffic on 12 September 2009. Route The 6th Ring Road runs within the confines of the municipality of Beijing. It is one of the most circular routes but still remarkably rectangular. Basic Route: Liuyuan Bridge - Liqiaozhen - Sanhui Bridge - Zhangjiawan - Majuqiao - Huangcun - Liangxiang - Mentougou - Zhaikou/Wenquan - Xishatun - Gaoliying - Huosiying - Liuyuan Bridge It is on the outer fringes of Beijing, and even beyond Beijing Capital International Airport. The expressway ring road is the only one to link with the equally remote Tongyan Expressway. History As early as 2000 or 2001, the southeastern stretch from Sanhui Bridge (interchange with the Jingha Expressway) through to Majuqiao (interchange with the Jingjintang Expressway) was put into operation. The route was first referred to as the projected 2nd Expressway Ring Road, much like the 5th Ring Road was once referred to as the 1st Expressway Ring Road; however, that name was abandoned in favour of the present-day 6th Ring Road. By 2002, a road section starting in Xishatun (interchange with the Badaling Expressway) through to Sanhui Bridge, as well as a stretch from Majuqiao through to Huangcun/Shuangyuan Bridge (interchange with the Jingkai Expressway), were complete and opened to the general public. Another 43 km of the expressway ring road opened behind schedule (the portion linking it up with the Jingshi Expressway and ultimately ending in Liangxiang in December 2004 and the section from the Badaling Expressway to Wenquan/Zhaikou in Mentougou in early January 2005). They were slated for a November 2004 opening. In the first case, the expressway was opened on December 20, 2004, at 14:00 local time, with over a month's delay. The entire road was opened in 2010. Road conditions Speed limit The minimum speed limit of 50 km/h, maximum 100 km/h, throughout. Potential speed checks at Zhangjiawan and 500 metres to the east of Yongdingmen/Langfang exit; otherwise, none. It is not rare for passenger cars to zip well in excess of that speed limit, while to see lorries underperform in speed. Southwestern 6th Ring Road: