Revised draft copy of the “Proposal for Supplement 9 to the 11 series of amendments to Regulation No. 13” returned by GRRF for revision.

Working draft of Annex 21-Appendix 1 to UN R13 on heavy-duty braking systems that would address the use of dynamic stability simulations.

Working draft of Annex 21-Appendix 2 of UN R13 on heavy duty braking to address the use and validation of the dynamic stability simulation tool for evaluating electronic vehicle stability control systems.

Copy of the text submitted to GRRF to clarify the requirements in Annex 21 of Regulation No. 13 regarding the use of simulation, specifically in the
Appendices 1, 2 and 3 of Annex 21.