It has been concluded in previous sections that there are several advantages to implement components of ITSs as services that are better known to software developers than intelligent agents. At the same time the principles of holonic multi-agent ITS architecture can be reused in the service oriented ITSs development. The following ideas have been identified to be is implemented as a set of distributed components. Secondly, only some of the components interact with other components outside the corresponding module to decrease coupling of the system. Thirdly, the ITS is implemented as an open system and new functionality can be added to the system by adding new distributed components, in particular services. The service oriented ITS architecture that realizes all the identified principles is described in the following subsection. The case study of the architecture is given in the Case study by presenting an ITS developed using the architecture.
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