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The subject of this work is to study the feasibility of reducing roll angle of commercial vehicles by applying an active roll stabilizer system. An experimental medium-duty truck is produced with the active roll stabilizer mechanism consisting of front and rear stabilizers whose one ends are connected to a hydraulic actuator for each. A feed-forward control algorithm for activating the actuators is applied to produce an anti roll moment which suppresses vehicle roll motion. Vehicle test showed considerable reduction of roll angle during steady-state-turning and lane-changing without sacrificing vehicle ride comfort.