In informal document GRB-66-12, Germany suggested making ASEP testing mandatory under UN R41.
This proposal from IMMA amends UN R41 towards the application of ASEP test procedures.

OICA discussion paper as further developed by the ASEP informal group on interpretation of the provision “The sound emission of the vehicle under typical on-road driving conditions, which are different from those under which the type-approval test set out in Annex 3 and Annex 7 was carried out, shall not deviate from the test result in a significant manner.”

ASEP informal group discussion paper on interpretation of the provision “The sound emission of the vehicle under typical on-road driving conditions, which are different from those under which the type-approval test set out in Annex 3 and Annex 7 was carried out, shall not deviate from the test result in a significant manner.”