With just over two weeks to go before the Chinese New Year, the annual Spring Festival travel rush known as "Chunyun" is officially underway. The 40-day travel period, which sees millions of Chinese travel across the country to reunite with their families, begins on January 14 and runs until February 22. Some 90 million railway tickets have been sold as of January 13. CGTN's Xu Hua is in Shenzhen with Zhu Tingting, a senior police officer at the Shenzhen General Station of Immigration Inspection, to learn more about this year's travel situation.