The longitudinal axis of the vehicle seeks to align itself in the curves by means of a vertical fin (VF) with two oblique surfaces (SFH) at one third of the vehicle length and curve blades at the rear at a tangent to medium and fast curves. Two wheel couplings are mounted on the drive wheels or axes, the oblique surfaces arranged in the front part of the vehicle. The vertical fin (VF) and its oblique surfaces continuously seek a line tangential to the curve or straight ahead which in turn is enforced by the specified curve blades. The wheel couplings adapt wheel speed to the tangent of the curve and in braking maintain drive torque. In fast braking, the rotative drive torque is left unbraked as required at this speed.
