We have to take various measures to realize the aim of the passenger traffic to low carbon cities,which includes:(1)constructing low carbon traffic ethics of citizens to upraise the cultural level of citizens' low carbon trip;(2) taking low carbon engineering measures to realize the reduction of carbon footprint to urban passenger traffic by scientific and technical means;(3) opening up the channel of investment and financing to eliminate the bottleneck of low carbon development of urban passenger traffic;(4) drawing up the scientific...