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An investigation of a steady-state motor vehicle steering characteristics is presented. The parameters that influence the steering response (e.g., front/rear load distribution, front and rear tire cornering stiffnesses, and tire slip angles) are included in the analytical development of the tire-vehicle system. A set of handling diagrams are obtained which show the influence of the tire-vehicle system's design factors and motion variables on the vehicle steering behavior. These diagrams are obtained for both the linear and nonlinear ranges of tire operation. THE PURPOSE OF THIS PAPER is to investigate the steady-state directional response of a vehicle negotiating a turn at a constant forward speed. The vehicle model, as shown in Fig. 1 includes yaw and sideslip motions, but not body roll and load transfer.