关键词: 交通运输系统工程, 智能交通系统, 一体化交通系统, 信息, 系统复杂性

Abstract:

This paper presents firstly that the trend of transportation systems is not only the ITS but also integrated transportation systems. The new viewpoint is dissertated on three aspects. Firstly, considering of the category the ITS belonging to, the passage analyzes the status of the ITS. Secondly,,thinking about the causes of the traffic problems，the paper also takes the effect range of ITS into account. At last, taking the traffic control and traffic inducement for example, the article shows that the traffic system must be integrated. And then, the information problem of the ITS is discussed from three points，that is the relationship between information and intelligence, the problem about quantity and quality of information, and the need of the intelligence by the development of IT. Afterwards, through the examples of 7 aspects，the ignorance of the complexity of traffic systems is explained. Finally, the necessity of using the methodology of system science to study on traffic system is raised.

Key words: ITS, integrated transportation systems, information technology, system complexity