people from different regions and backgrounds, with different life and dreams, do not know each other gathered in the city public transportation system everyday,this is quite norm daily life of over 20 million Beijingcitizens. Buddha said one pass-by in this life was exchanged from 500 get- back-stares in the previous life. so the ordinary people's casually pass-by moments are deserve to be documented.
The statistic in 2016 shows that Beijing have Bus lines operating in 877route, operating vehicles 24083, annual passenger volume of 4.7 billion , subway line of 17 and annual passenger volume of 2.907 billion .More than half percent of Beijing population travel by means of public transportation, Many of them even take more than 5 hours and more than 100 kilometers on the road per day. So to speak, They live a life on the road.