Table prepared by OICA highlighting various elements in the consideration of noise in UN Regulation Nos. 9, 28, 41, 51, 59, 63, 92, and 117.

Text prepared by the International Organization of Motor Vehicle Manufacturers (OICA) in order to introduce the concept of “revision of approvals” in the regulations under GRB responsibility.

Proposal to allow horn sound level testing with the engine running and lower the sound pressure level requirement for light-duty vehicles from 93 dB (A) to 90 dB (A).

Proposal (revised from its earlier version) to allow horn sound level testing with the engine running and lower the sound pressure level requirement for light-duty vehicles from 93 dB (A) to 90 dB (A).

The current UN R28 test procedures specify voltages that cannot be reached by many vehicles’ internal battery charges alone; however, the provisions can be met if the vehicle is warmed up and run at idle. Therefore, OICA proposes to allow vehicles to be run at idle during the test procedure. OICA also proposes to change the minimum sound level requirement for vehicles of category M and N and motorcycles of a power greater than 7 kW from 93 dB to 87 dB.

Review of vehicle horn regulations across various markets towards assessing the minimum sound level of 87 dB(A) under UN R28.

Proposal to amend the draft Supplement 5 to the UN R28. The draft supplement aims to refine definitions, removes the “AWD” abbeviation for “audible warning device” to avoid confusion with its more common use for “all wheel drive”, adds T category agricultural vehicles to the scope, modifies some administrative communications, and proposes three-direction acoustic measurements.