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3.1Signage terminalAn example of a display of the signage terminal is shown in Fig. 2 (a). e display consists of four informa-tional sections which exhibit (1) time and date, (2) weather information, (3) trac and emergency information and (4) the “contents” information including local govern-ment-related information, news, events and advertisements. e contents information can be either obtained from local government oce websites, or input manually by users. One type of signage terminal (S-F terminal) was placed at public facilities, such as a government oce (Fig. 2 (b)), and the other type (S-B terminals) in buses (Fig. 2 (c)). An S-B terminal in a travelling bus updates the information it displays as the communication device in the terminal ex-changes information with other terminals entering com-munication range. On the other hand, an S-F terminal updates the information it displays as it receives new in-formation from S-B terminals. In principle, both the S-B and S-F terminals operate at 20 mW. e exception to this is that we installed 250 mW communication devices in the Seika Kururin buses in order to put into practice the bus location notication service described below. All signage terminals are equipped with a built-in GPS receiver.3.2Rooftop terminalRooop terminals refer to test terminals placed in high places, such as on the top of buildings. ey can be used to expand the communication range so as to improve net-(4)Contents(government information, news and advertisements)(1)Date& Time(2)Weatherinformation(3)Traffic andemergencyinformation(a)　Signage displayFiF2　Signage terminal examples端末の例：バス設置サイネージ(b)　Signage terminal at a public facility(c)　Signage terminal behind a bus driver seat2 Terrestrial Communication Technology Research and Development46　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)