Dalian is the first city that puts forward the idea of city card in china.

Being taken as an important ring of the application layout of the "Digital City" by Construct Ministry of China, the "City Card" Tolling System has extremely important sense and ampliate market foreground.

City Card is cards which citizen can use the same contactless IC card to in different applications, such as: taking bus or taxi or subway, car parking, public spending, access control, attendance, dinning, conference attendance and so on.

This paper explains the connotations of the urban public traffic smart card system,introduces the general situation of Taiyuan\'s urban public traffic and the basic components of the urban public traffic smart card system,analyzes the architecture and safety factor of the urban public traffic smart card system,and probes into the benefit created by the urban public traffic smart card system.

Information Security Strategies of Smart Card System based on Campus Network;

The smart card system which used Siemens SIPASS access and security management system based on the device management needs of NARI building was designed.

Citizens Cards are smart cards developed for use in individual.

Environmental harmfulness of urban traffic systems at present isdiscussed.

To offer the guidance for the traffic practice,the theoretical researches on the urban traffic systems,should put emphases on the following problems,incorporating multidisciplinary theory and method together including complex networks theory,dynamics systems theory,modern control theory and traffic science and engineering et al.