![](https://citainsp.org/wp-content/uploads/2022/05/UNIQUE-IDENTIFIER-300x195.png)
Defined by the WP.29 for the 1958 Agreement, the
Unique Identifier (UI) is an initiative that removes the approval marking engraved in an approved device, like lamps, tyres, rear-view mirrors, etc. It replaces data with a reference, called UI, that leads to a PDF containing such information.
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