The combination of increasing population,growing demand for mobility, and limited funds and real estate for building new roads places a strain on the current transportation infrastructure. It seems that the vehicle control scheme should be changed. In order to this, it is necessary to design a machine or intelligent system that can cooperate with human in automobile driving. The roll of the machine depends on the human s behaviour. If human drives correctly, the machine command should not be effective, but, if he couldn t drive carefully for any reason, the roll of the machine would be more effective. Therefore, at first it should define a function that express the human s behavior within automobile driving. The goal of this paper is introducing a method which can estimate the human s performance within automobile driving. These data determine the level of human and machine autonomy. Fuzzy logic is used for human s behaviour simulation and for vehicle modelling, the single track bicycle model is used

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