The German ABE ( Allgemeiner Betriebs Erlaubnis ) rules are known to be more strict and rigorously enforced than any other EU or non-EU countries.
This dates back to several seventies vintage high speed autobahn accidents with aftermarket fairings on early Gold Wings and other brands at elevated speeds.
As we know - most other countries don't have free speed autobahns - hence also a less restrictive aftermarket equipment approval regime than Germany.
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2010 BMW F800GS
2008 KTM 690 RR
1994 Honda ST1100