km/h; third lane, min. 60 km/h, max. 80 km/h; fourth lane, min. 50 km/h, max. 80 km/h; auxiliary road, uniform max. speed limit of 70 km/h. Readjusted in 2004 so that all lanes have a uniform min. speed limit of 50 km/h and a max. speed limit of 80 km/h; aux. road max. speed limit of 70 km/h remains unchanged. Tolls This express road does not charge tolls. Lanes 8 lanes (4 in each direction) throughout. Traffic conditions The portion from Jianxiang to Siyuan Bridge, in both directions, is especially vulnerable to horrible traffic jams. The remainder of the northern and eastern portions are also vulnerable. Apart from the Fengtai area, the remainder of the 4th Ring Road has a lesser risk of being clogged up by traffic jams. Major exits Siyuan Bridge, Sihui, Sifang Bridge, Shibalidian, Majialou, Fengtai, Yuegezhuang, Zhongguancun, Jianxiang Bridge, Wanghe Bridge. Service areas No full-scale service areas exist; however, filling stations (gas stations) are plentiful in number. Connections Badaling Expressway: Connects to the Badaling Expressway at Jianxiang Bridge. Jingcheng Expressway: Connects to the Jingcheng Expressway at Wanghe Bridge (for the time being, only heading for Laiguangying and Chengde). Airport Expressway: Connects to the Airport Expressway at Siyuan Bridge (only heading for the airport). Projected Jingping Expressway: Would most likely connect at Dongfeng North Bridge. Jingtong Expressway: Connects to the Jingtong Expressway at Sihui. Jingshen Expressway: Connects to the Jingshen Expressway at Sifang Bridge (only heading for Shenyang). Jingjintang Expressway: Connects to the Jingjintang Expressway at Shibalidian. Jingkai Expressway: Connects to the Jingkai Expressway at Majialou. Jingshi Expressway: Connects to the Jingshi Expressway at Yuegezhuang. Signs When it was opened by 2001, the 4th Ring Road's signs were plagued by inconsistency. Mixing of Hanyu Pinyin and English on the signs confused drivers, but what was most confusing was the exit numbering. It so happened that the same exit had two different exit numbers—one for each direction of the ring road. Beijing authorities had three years' lapse before they dealt with the problem. Old signs were progressively replaced by newer signs which had standardised English and, finally, a new exit numbering system was in place. A sketch map of each exit, formerly only for expressways and isolated spots, was also introduced along with the new sign numbering. Another change was the use of traffic sign language to signal traffic regulations instead of relying completely on Chinese Hanzi. Some