A train leaves the platform at a subway station in Beijing, capital of China, July 22, 2008. More citizens and visitors in Beijing have taken the subway since July 20 when the city imposed controls to halve the number of vehicles on the roads for the Olympic Games, to be opened on August 8.

Passengers buy tickets at an automatic ticket machine at Tian'anmen east subway station in Beijing, capital of China, July 22, 2008.

Passengers take a subway train in Beijing, capital of China, July 22, 2008. More citizens and visitors in Beijing have taken the subway since July 20 when the city imposed controls to halve the number of vehicles on the roads for the Olympic Games, to be opened on August 8.

Foreign visitors walk into Qianmen subway station in Beijing, capital of China, July 22, 2008.

(Xinhua News Agency July 23, 2008)