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首先提出了交通系统的发展方向不单单是智能交通系统，而是一体化交通系统和智能交通系统的统一的新观点，并且从以下三个方面加以论述，即从所属范畴分析ITS的地位，从交通问题的成因来分析ITS的作用范围，以交通控制与交通诱导为例说明交通系统必须一体化.然后，从三个角度讨论了ITS信息化问题，即信息化与智能化的关系，信息的数量与质量问题，IT的发展也需要智能化.接着，列举了7个方面的例子说明存在着忽视交通系统的复杂性的现象.最后，分析了用系统科学的方法论研究交通系统的必要性.

Second Discussion About Some Theoretical Problems of ITS

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.