In November 1999 the system architecture was completed in Japan. Paralleling this was the completion of the DD, MS and PT drafts, the 3 elements for Japan's road communication standards, in March 2000. ITS systems introduced until the present by Japan's road administrators have been standalone systems. However, it will be necessary in future to utilise information in common and to promote integrated and efficient infrastructures. System architectures and road communication standards will become the platform for this, and they will need to be utilised in the construction of new systems. On the other hand, effective use of existing systems must also not be forgotten. Therefore, it will be necessary to consider migration. In this paper, the matters that need to be considered in studying migration methods are established, and then, based on this, an evaluation of 11 representative migration patterns is conducted and the results of a case study conducted based on the case of variable message signs is reported.
Samenvatting