In recent years, the Low Emission Vehicle, especially the Compressed Natural Gas Vehicle (CNGV), is expected to solve an environmental problem such as an air pollution in urban areas or grobal warming. However, a delay of the improvement of fueling facility prevents it from diffusing in urban areas. The purpose of this study is to explain the issue of the exisiting method which annexes the CNGV filling station to a exisiting gas station and to propose alternative which uses a parking lot instead. Through the case study of Tokyo twenty-three wards, this paper concludes that the proposal is an effective solution.

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It is no doubt that an electric vehicle (EV) is going to be a main stream of the transportation resource for persons in the next century. The influence for EV, on the other hand, should be managed properly in accordance with the penetration revel. This is because that the influence caused by chargers seems to be an important issue for both the technique on the distribution level and the social aspect. For the time being, chargers are situated in the particular places, though appropriate installation is required to construct a convenient and accessible infrastructure for EV users. This is also important for the acceleration of EV penetration.
Besides, Voronoi mapping is well known method for the proper configuration of equipment geographically. We apply this method to arrange the chargers of electric vehicle in Tokyo metropolitan region properly. Under sufficient survey both of the gas station's market and the properties of the potential EV customers and geographical conditions, we use a weight table to evaluate these factors appropriately. Accordingly, we present an optimal installation technique for EV chargers using the weighted Voronoi mapping method. We also show the prospected shortest distance among the charges in case of 100 chargers situated in Tokyo area. Furthermore, we present a practical example for the proper configuration of chargers for EV in 2010.

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