22. The expert from CLEPA introduced presentation GRSP-70-22 to explain the effect of chin-to-chest contact of dummies during type approval testing and potential solutions. GRSP endorsed in principle, as a pragmatic solution, the proposal from the expert from CLEPA that introduced the neck tension force limits based on measured type-approval monitoring data as proposed in GRSP-68-05. GRSP requested to continue sharing information at its May 2022 session on this subject awaiting an official proposal from the expert from CLEPA based on GRSP-68-05.

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.

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.

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.