lock

Lock

1) Structure at each end of a short stretch of canal (inland waterway) comprising gates and sluices that are opened and closed to change water levels.

Anti-lock braking (ABS)

1) Anti-lock braking system. A safety system by which vehicle brakes are prevented from locking the road wheels thereby preventing skidding. Works by rapidly applying and releasing brakes so as to prevent wheel lock-up, which would induce a skid.

Diff-lock

1) Differential locking system in heavy vehicle drive line by which wheel-slip (ie wheel spin) by one set of wheels, or one axle, relative to another is detected - automatic locking is effected until traction is regained.