Heavy truck on board yaw rate recordings are used to discriminate between different driving maneuvers and motions such as turning a curve, changing lanes, or wandering in a road lane. Such discrimination is important for trucks using a front end radar as a sensor for adaptive cruise control and collision warning systems. Turns can cause radar returns from objects outside the roadway or confuse the adaptive cruise control operation. A methodology for determination of a maneuver is derived and then applied to driving data. Correlation of the results is validated by the use of video data. The method has been found to be approximately 80% accurate in identification of the truck maneuver.