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CRS booster seat width development
Document CRS-54-11
27 October 2015

Presentation of proposal for interim solution to allow for booster cushions without a backrest to be kept in UN R44 (but prohibited for children smaller than 125 cm) pending development of provisions for non-integral i-Size booster seats with integrated backrest under UN R129 (Phase2).

Submitted by CLEPA
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Previous Documents, Discussions, and Outcomes
4. | Validation of Amendment of ECE R44
5. | Validation of Amendment 1 of ECE R129
6. | Work on Amendment 2 of ECE R129 (phase II)
6.1. | Double marking on modular systems
6.2. | Shoulder belt positioning
6.3. | Feedback from TRL study (Chest deflection measurement,…)
6.4. | Humanetics Q3 presentation
6.6. | CLEPA presentation on booster seat width development from Farid BENDJELLAL (BRITAX)

In the presentation it was shown:

  • Key change in IG direction from Germany & European Commission,
  • Comparison of regulation requirements between R44 & R129,
  • Positive & negative aspect for the 440 mm width proposal,
  • Compatibility with vehicles (only few vehicle can fit 3 × 440 mm width fixture),
  • Consequences for safety (Poorer or no head containment, increase chest loading, performance worse than R44 regulation, Q6 does not represent the seating height of a seated 135 cm child; the seating height of the Q10 is much closer and should be used)
  • Consequences of amending the dummy selection table
  • Vehicle handbook proposal.

In conclusion, limiting the TF4 fixture from the current 520 to 440mm width:
  • only allows 3x fixtures in a small minority of current vehicles,
  • need to assess seating position for i-Size and Universal booster seat,
  • 440 mm width will results in a reduction in safety,
  • the German workshop has shown that fitting 3x R44 seat (500 mm width) is possible, compromise width of 480 – 500 mm would mean no reduction in safety,
  • Q10 should be used to evaluate the seating height for CRSs designed for 135cm children in front & side impact ,
  • a simplified vehicle handbook approach could be beneficial e.g. 100- 135 cm as Universal & 136 – 150 cm as vehicle specific.

CLEPA needs a minimum of 500 mm width and suggests to IG to wait for full conclusions from the German workshop before deciding the final width. Any compromise to be reached should mean an enhanced protection for 3 to 10 years old, comparable or higher performance relative to existing R44 CRSs, promoting simultaneous fitment of 2 i-Size CRSs in every vehicle, 3 i-Size 440 mm CRSs may fit in small number of larger vehicle.

Peter BROERTJES (EC) : Family car could install 3 i-Size positions, which was the main goal.

Pierre CASTAING (UTAC & Chairman) : 135 cm 50% children can be seat in a family car. 3 current booster seats can be installed in a family car, but the F5 fixture currently proposed would be such an installation, even in a large family cars there is no room to accommodate this fixture. The Q10 dummy represents a 50th percentile child of 10.5 years. It has also been found to match the key dimensions (sitting height, shoulder height, and shoulder width) of a 95th percentile child of 135 cm stature. However, the Informal Group has decided that it is no longer necessary for booster seats to accommodate 95th percentile children at this stature, and on that basis, only the Q6 dummy is specified for testing. The Q10 dummy represents a 50th percentile child of 10.5 years. It has also been found to match the key dimensions (sitting height, shoulder height, and shoulder width) of a 95th percentile child of 135 cm stature. However, the Informal Group has decided that it is no longer necessary for booster seats to accommodate 95th percentile children at this stature, and on that basis, the Q6 dummy is specified for testing child restraints with a declared upper stature limit of 135 cm.” child restraints with a declared upper stature limit of 135 cm.

Ronald VROMAN (ANEC) : Consumers request a simple and clear statement, where a child could be installed from 0 to 135 cm in a universal position, without having to refer to a user’s manual.

6.7. | Presentation of German workshop organised by the German Kindersicherheit Kreiss (“child safety working group”) from Sebastian WEBER (AUDI)
8. | Work on phase III
10. | Any other business
Relates to UN R44 | UN R129 |