A system for predicting a driver's intention to change lanes, comprising: an ego vehicle sensor for detecting information on a motion of an ego vehicle; an environment sensor (2, 3, 4) for detecting information on a motion of a vehicle traveling within a prescribed distance ahead of the ego vehicle in a same lane as the ego vehicle and/or on a motion of a vehicle traveling within a prescribed distance from the ego vehicle in an adjacent lane; a motivator computing unit for computing a motivator indicating a driver's intention to change lanes from the current lane to the adjacent lane according to outputs of the ego vehicle sensor and environment sensor (2, 3, 4); an inhibitor computing unit for computing an inhibitor indicating of a driver's intention not to change lanes from the current lane to the adjacent lane according to the outputs of the ego vehicle sensor and environment sensor (2, 3, 4); and a prediction unit for predicting the drivers intention to change lanes by comparing outputs of the motivator computing unit and inhibitor computing unit; wherein the motivator computing unit is configured to determine if any of a plurality of motivator criteria are met, and the inhibitor computing unit is configured to determine if any of a plurality of inhibitor criteria are met, wherein the motivator computing unit and the inhibitor computing unit are adapted to determine the motivators and inhibitors from the speed of the traffic ahead of the ego vehicle and the traffic in the adjacent lanes in relation to the traveling speed of the ego vehicle, wherein the prediction unit is adapted to predict the driver's intention to change lanes by comparing a weight of the motivator criteria that are met with a weight of the inhibitor criteria that are met, and wherein the motivator computing unit and the inhibitor computing unit are adapted to determine the motivators and inhibitors before the vehicle operator starts a lane changing manoeuvre. an ego vehicle sensor for detecting information on a motion of an ego vehicle; an environment sensor (2, 3, 4) for detecting information on a motion of a vehicle traveling within a prescribed distance ahead of the ego vehicle in a same lane as the ego vehicle and/or on a motion of a vehicle traveling within a prescribed distance from the ego vehicle in an adjacent lane; a motivator computing unit for computing a motivator indicating a driver's intention to change lanes from the current lane to the adjacent lane according to outputs of the ego vehicle sensor and environment sensor (2, 3, 4); an inhibitor computing unit for computing an inhibitor indicating of a driver's intention not to change lanes from the current lane to the adjacent lane according to the outputs of the ego vehicle sensor and environment sensor (2, 3, 4); and a prediction unit for predicting the drivers intention to change lanes by comparing outputs of the motivator computing unit and inhibitor computing unit; wherein the motivator computing unit is configured to determine if any of a plurality of motivator criteria are met, and the inhibitor computing unit is configured to determine if any of a plurality of inhibitor criteria are met, wherein the motivator computing unit and the inhibitor computing unit are adapted to determine the motivators and inhibitors from the speed of the traffic ahead of the ego vehicle and the traffic in the adjacent lanes in relation to the traveling speed of the ego vehicle, wherein the prediction unit is adapted to predict the driver's intention to change lanes by comparing a weight of the motivator criteria that are met with a weight of the inhibitor criteria that are met, and wherein the motivator computing unit and the inhibitor computing unit are adapted to determine the motivators and inhibitors before the vehicle operator starts a lane changing manoeuvre.