City Express Roads of Beijing

Beijing's city express roads (城市快速路, Hanyu Pinyin: Chengshi Kuaisu Lu) are a mix between expressways and trunk roads. The concept here is to create a "mini-expressway" inside urban or central Beijing, but at the same time avoid creating a costly, full-blown expressway.
The main difference between a city express road (CER) and a trunk road (TR) is that a CER is free of traffic lights and at-level crossings. TRs, however, have at-level intersections, some with traffic lights.
A slightly higher speed limit (80 km/h instead of 70 km/h) applies on CERs. On TRs, the maximum speed limit is 70 km/h.
The three inner ring roads (i.e. all ring roads except for the 5th and 6th Ring Roads) are classified as CERs. There is also a single toll CER -- the Jingtong Expressway. The 5th Ring Road, despite removal of tolls, is still considered an expressway since it has a provencial-level expressway designation of S50.
==Opened City Express Roads==
(List is not complete)
* Extended Lianhuachi West Road (Lianhua Bridge - Mentougou)
* Jingcheng Express Road Link (Taiyanggong Bridge - Wanghe Bridge only)
* Northeastern Urban Road Link
* Fengbei Road (Fengbei Bridge - Jingshi Expressway) (opening soon)
==City Express Roads Under Construction==
* Tonghuihe North Road
* Fengbei Road (Lize Bridge - Fengbei Bridge)
* Puhuangyu Road (southern extension)
* Western Xizhimen Outer Street extension
==City Express Roads Under Projection==
* Jingshen Expressway link to the 2nd Ring Road
* Fushi Road
* Yaojiayuan Road
* Xueyuan Road (northern extension)
==Possible City Express Roads==
* Jingcheng Express Road Link link into the 2nd Ring Road (the express road link flies over the 3rd Ring Road; it does not actually end there).