The major assumption used in the development of the kinematic model is that the velocity vectors at points A and B are in the direction of the orientation of the front and rear wheels respectively. In other words, the velocity vector at the front wheel makes an angle 6f with the longitudinal axis of the vehicle. Likewise, the velocity vector at the rear wheel makes an angle 6, with the longitudinal axis of the vehicle. This is equivalent to assuming that the "slip angles" at both wheels are zero. This is a reasonable assumption for low speed motion of the vehicle (for example, for speeds less than 5 mls). At low speeds, the lateral force generated by the tires is small.