22 Jul 2019 UN R138: Proposal for Supplement 2 to the 01 series of amendments (Germany) GRBP-70-04 2019-07-22 Proposal to reconcile UN R138 with UN R51 with regard to maximum sound pressure levels at speeds greater than 20 km/h by clarifying that the 75 dB(A) limit for AVAS under UN R138 concerns only the 0-20 km/h speed range. Germany