The expert group on the 2nd phase development of GTR No. 7 has proposed a new method for measuring head-restraint height and, using this method, proposed to specify heights between 720-830 mm. OICA accepts the new measurement method, but argues for keeping the current 800 mm specification on the grounds that 800 mm under the new method would be 830 mm under the old.
6. The expert from the Netherlands introduced ECE/TRANS/WP.29/GRSP/2013/17, aimed at increasing the height of the head restraint at the front driver seating position, to cover taller occupants, and decreasing the lowest height of head restraints at the front passenger seating positions for reason of visibility. The expert from the United States of America argued (GRSP-54-23) a lack of rational for both proposed height values. The expert from OICA renewed his concern (GRSP-54-18-Rev.1) that the new measurement procedure would reduce the measured height by 30 mm; and that associated with the new limit of 830 mm would result in increasing the height of the head restraints by 60 mm compared to the current requirements. Finally, GRSP agreed to resume consideration of this agenda item on the basis of final proposals submitted by the IWG and of further justification concerning ECE/TRANS/WP.29/GRSP/2013/17 and to keep GRSP-54-18- Rev.1 and GRSP-54-23 as references.