With the evolution of the productive methods and life styles of human beings, the urban traffic has greatly changed in both connotation and denotation. Nowadays, the urban traffic has become the tache and artery of the social economy. After stepping into the 21st century ,with the rapid, continuous and stable economic development of our country, the urban synthetical strength has been further strengthened; the modern urban traffic ,with various modes and abundant contents, has greatly accelerated...