| 摘要 |
The coupling unit of an articulated vehicle is locked to prevent jacknifing or trailer swing, by releasable locking means which may be mechanical or hydraulic. The locking means are selectively released only in response to steering movements of the vehicle, so as to permit limited and preferably unidirectional, relative angular movement of the tractor and trailer, only by an amount and in a direction determined by the magnitude and sense of the steering movements.
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