Weather disrupts travelers making their way home

Snow, icy rain and fog caused flight delays and highway closures in many parts of China on Tuesday, the last day of the weeklong Lunar New Year celebration, when millions of travelers head back to school or work.

The return travel spree is even heavier than the preholiday migration, known as chunyun.

Beginning 14 days ahead of Lunar New Year, or Spring Festival, millions of people head home to reunite with family in the Chinese tradition. It is thought to be the world's largest human migration, as 2.8 billion trips are expected during the 40-day travel period ending March 16.