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This paper discusses the desired steer angle characteristics of rear wheels in the new concept of four wheel steering system in which the rear wheels are controlled as a function of the steering wheel angle in a manner that the rear wheels are steered in the same direction as the front wheels when the steering wheel angle is kept within a small range while the rear wheels are steered in the opposite direction to the front in the case the steering wheel angle is steered over a larger range. This paper also indicates the basic principle of the four wheel steering system and lists items for consideration in determining the function, and then presents a variety of effects the new steering system produces on operating performances based upon a series of proving ground tests.