Improving access

Guo Taisheng, a professor at People's Public Security University of China, conducted research on subway security in Shanghai in May and found a few gaps.

He suggested adding more exits to improve security.

Shanghai's Renmin Guangchang subway station handles about 3 million visits a day but it has more than 20 exits, "which can effectively split crowded passenger flow and provide more convenience for commuters", Guo told China Daily.