Abstract: An anti-jackknifing and skidding control system for trailer trucks is described, wherein a linear accelerometer located on the rear of the trailer detects left or right skidding and provides automatic differential braking action to the left or right wheels depending on the direction of skidding to be corrected. The system distinguishes a usual coordinated turn or truck maneuver from a skidding condition to correct only for the latter. In addition, wheel locking is prevented by releasing the braking action, when such wheel locking is detected.