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China has 260 million migrant workers by 2012. They usually leave their hometown to seek employments in urban areas.

Snow or sleet is expected to hit Inner Mongolia Autonomous Region, most of northeast China and some parts of Guizhou Province from Sunday to Tuesday, the National Meteorological Center said in a statement, adding that these regions may see moderate to heavy snow.

"China should stress education on new drivers and impose stricter exams to prevent disqualified drivers from hitting the roads," said Zhang Mingsuo, sociology professor at Zhengzhou University.

The ministry noted that calculations used before 2006 did not take into account the increasingly strong population flow of students against the backdrop of fast urban construction.

A separate press release from the railway authority also reported "sound operations" during the week-long holiday in which railways handled 34.68 million passengers.