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This paper describes an autonomous traffic flow simulator including inter-vehicle and road-to-vehicle communications. First, autonomously running vehicles traffic flow is modeled in detail, and the modeling of the assumed driving assistance system, inter-vehicle communications and road-to-vehicle communications is carried out. Next, based on such modeling, a microscopic traffic flow simulator is constructed, and performance evaluation methods are mentioned. Finally, as examples of performance evaluations, effects of shadowing in inter-vehicle communications and road-to-vehicle communications are examined.