Friction Sway Control uses friction to resist pivotal movement and thereby works against theeffects of induced sway. lt operates on the principle of "stiffenina" the coupling between the towvehicle and trailer. The degree of "stiffening" or friction is adjusted to suit various trailer weightsand towing conditions. lts operation is simple and uncomplicated. lt doesn't prevent the generationof sway; it simply works to resist the forces once they have started.