Abstract: An arrangement in articulated vehicles for avoiding uncontrolled articulation movements between participating vehicle units. A transducer, sensing instantaneous speed of at least one driven vehicle wheel on the trailing vehicle unit, sends a signal in response thereto to a comparator circuit where the signal is compared with a reference signal representing a normal value for the wheel speed. If a predetermined speed difference is indicated, the comparator circuit activates means such as an operating power control means and/or an articulation brake, for limiting the articulation movement.

Abstract: An arrangement in articulated vehicles for avoiding uncontrolled articulation movements between participating vehicle units, particularly occurring in vehicles equipped with driving wheels on the trailing unit where driving takes place as a thrusting movement. Power transmitted to the driving wheels is limited in response to different operating conditions for the vehicle units, represented by articulation angles and/or different wheel speeds on leading and trailing vehicle units. By means of sensors sensing current operational conditions, circuits comparing sensor signals and power control means controlling the driving unit for limiting the power transmitted to the driving wheels in response to the signals, uncontrolled articulation movements are avoided.