70. The expert from OICA presented GRSG-116-29 on the possible installation of aerodynamic devices on commercial vehicles cabs to improve aerodynamic performance. She introduced GRSG-116-28 that amends the provisions of UN Regulation No. 58 to allow installing such aerodynamic devices at the rear end of vehicles. She added that the provisions of new Annex 8 should ensure that aerodynamic devices shall not compromise the functionality of rear underrun protection devices. GRSG noted general support for the proposal. The expert from Canada informed GRSG that the installation of such aerodynamic devices had been allowed in his country since 2013 and announced that he would share a study by his Government on this subject at the next GRSG session. The expert from Sweden was of the opinion that new Schedule 8 of the 1958 Agreement would allow virtual testing methods for such aerodynamic devices. The expert from Japan preferred to add a clarification that aerodynamic devices should be omitted when measuring the dimensions (e.g. length) of the vehicle. The expert from EC proposed to proceed with the proposal as a Supplement to the UN Regulation as the new requirements were not mandatory and only considered as optional “if fitted” requirements.

71. GRSG agreed to resume consideration of this subject at its next session based on a revised proposal by OICA to be circulated, if available, as an official document.