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This paper describes the evaluation on the safety performance of a driving assistance system based on a fusion network of inter-vehicle communication and in-vehicle external sensors in which the other vehicles' running information acquired by in-vehicle external sensors and own running information acquired by internal-sensors. The safety performance is evaluated by microscopic traffic simulator in a mixed environment of the three types vehicles(system equipped vehicle with communication and sensor devices, system equipped vehicle with only communication devices, and vehicle without driving assistance system). The result of simulation indicates that when the half of vehicle which has communication function equips an external sensing function, the safety performance of the driving assistance system in the fusion network of inter-vehicle communication and in-vehicle external sensors rises up than that in the conventional inter-vehicle network which only shares the in-vehicle running information. Especially, it greatly improves the safety of the vehicle with only communications equipment.