A school bus runs on the rural road in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran)

Safety staff Rui Qihua helps pupils to get off a school bus in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran) 

Driver Feng Yongxiang drives a school bus in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran)

A teacher helps a pupil fasten the seat belt on a school bus in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran)

A working staff uses the GPS to monitor the situation of school buses in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran) 

Pupils pose on a school bus in Zhongwei City, Northwest China's Ningxia Hui Autonomous Region, March 29, 2013. (Xinhua/Li Ran)