Although double-lanyard systems remain a seemingly obvious answer for moving horizontally on many present structures without the provision of horizontal lifelines, their use is cumbersome. An interesting variant used in Japan employs a simpler system that includes a keybox attached to the worker’s belt. One lanyard key is inserted and remains attached until a second lanyard key is inserted in another opening. This action ejects the first lanyard key and allows unhindered transfer past obstructions or supports while ensuring continuous protection.
See “Introduction to Fall Protecton, 4th Edition” page 242.
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