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The lug nuts on this truck wheel indicate when loosening has occurred. The plastic pointers create an easily recognizable pattern. if any loosening of a nut occurs the pattern will be broken and easily identified and remediated by the driver. In this case, just making problems easier to detect is very beneficial.
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Categories:


Mistake-proofing category: mistake detection
Setting function: information enhancement
Regulatory function: Sensory Alert
Source: Off-the-shelf

Links:

Secondary Problems (side effects, weakness or concerns) with this example:

Literature:

Sources of Supply: http://www.wheel-check.com/

See also:

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