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Recently, inter-vehicle communication systems based on the multi-hop ad-hoc wireless communication systems have been discussed in the field of ITS telecommunications, disaster management communications and so on. In this paper, we report and discuss about the examination of physical layer of multi-hop ad-hoc inter-vehicle wireless communication system which has been newly developed for multiple purposes, especially for the disaster management. We aim at the multi-hop communications system for disaster which used the disaster prevention using a VHF band from such a background. For starting the development of the ad-hoc communications system, for example, the possibility in existing communications systems, such as 802.11, etc. is taken into consideration. We examined various system simulations, about each class of the physical layer, the MAC section and a network layer. To get the optimal solution, examination was performed from the stage of a basic system design, the equipment trial production was performed after checking the validity for the practicality check in the field. This paper describes especially the outline of the simulation result of having followed the MAC section which is one of the fundamental components of this system as basic examination of an equipment trial production, and the physical layer portion.