Proposal to introduce installation specifications for securing a cab mounted on a vehicle to the test rig for tests B and C, as is currently provided for test A, under UN R29. This proposal aims to improve repeatability and reproducibility while allowing more flexibility in permitting the use of rigid composite blocks and/or (adjustable) metal brackets in securing the vehicle in the place of the wooden block presently prescribed in Figure 1.

22. GRSP resumed discussion on this subject on the basis of a revised proposal of Germany (ECE/TRANS/WP.29/GRSP/2018/5) on how to secure a cab mounted on a vehicle on the test rig that allowed the use of rigid composite blocks and/or metal brackets instead of the wooden blocks, and on the necessity to secure the vehicle with ropes or chains for test C. GRSP adopted the proposal not amended and requested the secretariat to submit ECE/TRANS/WP.29/GRSP/2018/5 as draft Supplement 4 to the 03 series of amendments to UN Regulation No. 29 for consideration and vote at the November 2018 sessions of WP.29 and AC.1. GRSP was informed about an issue raised during at the February 2018 session of Working Party on Brakes and Running Gears about road accidents involving trucks that point to the mechanical failure of the steering gear. The expert from Germany clarified that UN Regulation No. 29 did not include the steering gear mechanism in its testing provisions.