This case involves a man who suffered injuries while unloading a tractor trailer. The man was on the loading dock when the tractor trailer suddenly, and without warning, pulled away. There were locking devices embedded in the dock with hooks that locked the underride bar in place. In this instance, the lock broke when the trailer pulled away. It is alleged that the lock system was faulty and the unexpected departure of the truck caused the plaintiff to suffer serious injuries. The plaintiff had been unloading wares from the back of the truck when, suddenly, the truck began rolling away from the dock, causing the plaintiff to fall and sustain serious injuries.