Millions leaving Beijing for Spring Festival at hometown (1/3)

Vehicles drive slowly on an expressway out of Beijing, Feb. 16, 2015. About 2.8 billion trips are expected nationwide during the 40-day Lunar New Year travel rush. Beijing's population grew to 21.52 million by the end of 2014, making it one of the most populous cities in the world. Around 8.19 million migrants lived and worked in the capital last year.(Photo/CFP)