31. GRBP was briefed on the activities of the OICA/ACEA Task Force on Exterior Acoustic Signalling on developing guidelines for exterior acoustic signals (GRBP-82-21). GRBP noted that, once ready, the guidelines should be brought to the attention of the Working Party on General Safety Provisions (GRSG), as a number of UN Regulations in the scope of GRSG provided for exterior acoustic signals.