AUDIBLE ALARMS ARE LIMITED
Audible beeping alarms are fine and have been used successfully for many decades. However audible alarms are frequently "drowned out" and ignored as workers get used to the sound especially in loud industrial settings. Today there is also more widespread use of worker ear plugs mandated by corporate safety to protect the worker. This problem with audible alarms is exacerbated when there are multiple lifts and cranes working simultaneously in the same area.
An audible beeping reverse alarm serves more as a general caution to employees working in the area, however this still requires workers to identify the hazard and assess whether its proximity is dangerous. Unlike an audible "beep"- the actual movement of a light on the floor from a forklift or overhead crane provides a definitive warning to affected pedestrian employees - those in the immediate danger area.
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