A vehicle comprising: a sprung mass and an unsprung mass ; a first sensor for detecting vertical motion of the unsprung mass or a quantity from which vertical motion of the unsprung mass can be derived; a second sensor for detecting vertical motion of the sprung mass or a quantity from which vertical motion of the sprung mass can be derived; a controllable force source that couples the sprung mass and the unsprung mass and that is capable of exerting a force in response to a control signal and without a physical stimulus; a controller coupled to the force source and configured to cause the force source to generate a force between the sprung mass and the unsprung mass, wherein the controller is configured to: receive a first signal from the first sensor, based on the first signal, determine the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the unsprung mass in a first frequency range and receive a second signal from the second sensor, and determine, based on the second signal, the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the sprung mass in a second frequency range that does not include the first frequency range. a sprung mass and an unsprung mass ; a first sensor for detecting vertical motion of the unsprung mass or a quantity from which vertical motion of the unsprung mass can be derived; a second sensor for detecting vertical motion of the sprung mass or a quantity from which vertical motion of the sprung mass can be derived; a controllable force source that couples the sprung mass and the unsprung mass and that is capable of exerting a force in response to a control signal and without a physical stimulus; a controller coupled to the force source and configured to cause the force source to generate a force between the sprung mass and the unsprung mass, wherein the controller is configured to: receive a first signal from the first sensor, based on the first signal, determine the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the unsprung mass in a first frequency range and receive a second signal from the second sensor, and determine, based on the second signal, the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the sprung mass in a second frequency range that does not include the first frequency range. receive a first signal from the first sensor, based on the first signal, determine the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the unsprung mass in a first frequency range and receive a second signal from the second sensor, and determine, based on the second signal, the force to be applied by the force source, wherein application of the force to be applied by the force source reduces vertical motion of the sprung mass in a second frequency range that does not include the first frequency range. <EOS>