Outside the loading dock opening, from a fixed location above the dock door, the Approach-Vu Sensor detects the motion of a tractor-trailer backing into a dock position. A visual and audible alarm, located on the Dok-Lok vehicle restraint, alerts dock workers and pedestrians in the drive approach of the impending danger. This multi-sensory alert system is particularly helpful because ambient noise often masks the sound of a cab’s noisy engine, which can be 70 feet or more from the back of the trailer.
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