23. GRSP resumed discussion on limit values on the chest vertical acceleration of Q-dummies during the dynamic testing of ECRS, on the basis of GRSP-68-05 tabled by the expert from CLEPA. The expert from CLEPA introduced the proposal through a presentation (GRSP-68-10) showing GRSP that collection and analysis of data monitoring was progressing. He further encouraged Contracting Parties to the 1958 Agreement to provide data to support the analysis and the proposed limits. The expert from Spain introduced a presentation (GRSP-68-26), showing the test results conducted by her technical service on the effects of dummy type Q1.5 chin-thorax contact in measuring upper neck forces. GRSP noted that further data collection was needed and agreed to resume discussion on this topic at its May 2021 session.

23. GRSP resumed discussion of ECE/TRANS/WP.29/GRSP/2019/19 on limit values on the chest vertical acceleration of Q-dummies during the dynamic testing of ECRS, as agreed at its December 2019 session (see ECE/TRANS/WP.29/GRSP/67, paragraph 41). The expert from CLEPA recalled to GRSP that this decision aimed to allow the collection and analysis of data monitoring. The expert from CLEPA clarified (see GRSP-67-23) that data were subsequently provided by the Type-Approval Authority and the Vehicle Certification Agency (VCA) of the United Kingdom. He added that these were supplemented with a sample from CLEPA, in order to derive the proposed limits for tension force, Fz and flexion moment. He then introduced a proposal (see GRSP-67-24) of amendments to the injury assessment criteria for frontal and rear impact to specify limit values for tension force and flexion moment measured in the upper neck of the Q0, Q1 and Q1.5 dummies. However, he recommended that other contracting parties also provide monitoring data to support this analysis and confirm the proposed limits. GRSP endorsed the request of the expert from CLEPA and agreed to resume discussion at its December 2020 session based on a revised official proposal. Moreover, the experts from the Global NCAP and ANEC on behalf of CI withdrew ECE/TRANS/WP.29/GRSP/2019/19. GRSP agreed to defer consideration of GRSP-66-28 to the December 2020 session, due to the lack of time.

41. GRSP agreed to defer discussion on ECE/TRANS/WP.29/GRSP/2019/19 and amendment GRSP-66-28 to its May 2020 session. The expert from the Netherlands also withdrew ECE/TRANS/WP.29/GRSP/2019/36. The expert from CLEPA introduced three proposals : (a) to provide instructions to consumers in a digital form (GRSP-66-11), (b) on essential measurement information to be recorded in the type approval system (GRSP-66-12) and (c) to improve the procedure for assessment of the external dimensions of ECRS (GRSP-66-13). GRSP agreed to hold informal documents GRSP-66-11, GRSP-66-12 and GRSP-66-13 and wait for possible new documents at its May 2020 session.

35. The expert from GlobalNCAP also introduced GRSP-65-06 proposing limit values for the chest vertical acceleration of Q-dummies during dynamic testing of Enhanced Child Restraint Systems (ECRS). The expert from CLEPA expressed general concern and raised a time reservation. The expert from United Kingdom stated that a permanent solution was needed. He added that this was not the case to implement the chest vertical acceleration but rather to develop the upper neck tension force on the basis of available data. The expert from EC stated that discussion should be deferred until data was available. The expert from CLEPA expressed similar view and suggested collecting support data before the December 2019 session of GRSP. The Chair of GRSP suggested to create a TF led by a representative of a contracting party to coordinate efforts. GRSP agreed, in principle, with the proposal of Chair and agreed to resume discussion at its December 2019 session on the basis of the outcome of above-mentioned TF research. At the same time GRSP requested the secretariat to distribute GRSP-65-06 with an official symbol at its next session.