China on Friday kicked off its busiest annual period of mass migration with a record 9 billion domestic trips expected to be made during a 40-day travel rush around the Lunar New Year holidays, state media predicted. Millions of people will travel back to their home towns to reunite with families for the Lunar New Year, which falls on Feb. 10 this year, in the world's largest mass migration each year. About 80% of the 9 billion trips will be self-driving road trips, also a record, with the rest by rail, air, and water, Chinese state television CCTV reported.