Annex 1 described the determination of the highest head restraint height at paragraph 2.3.3. as follows: "2.3.3. Determination of the highest head restraint height. The head restraint height is the distance from the R-point, parallel to the torso reference line and limited by a line perpendicular to the torso reference line intersecting IP.After the coordinates of IP are determined, the highest head restraint height can be calculated by its longitudinal (ΔX) and vertical (ΔZ) distance from the R-point, as follows: Head restraint height = ΔX ∙ SIN (design torso angle) + ΔZ ∙ COS (design torso angle)" IWG discussed the proposed method of head restraint height measurement and noted some issues remaining concerning certain head restraint shapes and the measurement device. The task force considered these issues and the IWG discussed them further at the following meeting. 156. At the fifty-first GRSP session, the expert from the Netherlands introduced a proposal to increase head restraint height (GRSP-51-24). The expert from OICA stated that the discussion should focus first on the definition of the measurement method and then on the height thresholds. GRSP agreed to resume discussion at its December 2012 session on the basis of a possible proposal of draft UN GTR No. 7, Phase 2 that may be submitted by IWG. 157. At the workshop held in the middle of March 2013 at Federal Highway Research Institute (BAST), effective head restraint height measurement procedure was examined by using an actual vehicle. The workshop finding are in Annex 1 of this UN GTR. The workshop also concluded that the backset can be measured without HRMD. 158. At the fifty-third GRSP meeting, the expert from the Netherlands proposed head restraint height requirements (GRSP-53-15) and GRSP resumed discussion at its December 2013 session on the draft proposal submitted by the experts from the Germany, the Netherlands and the United Kingdom. 159. At the fifty-fourth GRSP meeting, the expert from the United States of America questioned (GRSP-54-23) the rational for both proposed height values. The expert from OICA observed (GRSP-54-18-Rev.1) that the new measurement procedure would reduce the measured height. GRSP agreed to resume consideration on this agenda item on the basis of a final proposal of draft amendment submitted by the IWG and of further justification (ECE/TRANS/WP.29/GRSP/2013/17). 160. At the fifty-eighth GRSP meeting, the Netherlands informed GRSP that further improvements to the height measurement procedure of head restraint would be possible and withdrew document ECE/TRANS/WP.29/GRSP/2013/17. The proposal was further developed in the latest document ECE/TRANS/WP.29/GRSP/2015/34. The experts from Australia, China, Denmark, France, Germany, Hungary, Japan, the Netherlands, Republic of Korea, Sweden, Spain, United Kingdom, United States of America, Russian Federation and EC supported the proposal of a head restraint height requirement of 830 mm and 720 mm as proposed by the experts from the Netherlands, Germany and the United Kingdom, in reference to the 2007 EEVC study report. The experts from India stated that he could agree with the proposal on the condition that a footnote would allow contracting parties to restrict the requirements at the national level. Italy agreed with India on the higher height of head restraint. GRSP also adopted the proposal of the expert from OICA for the above-mentioned footnote as follow: "A contracting party may opt for a lower value in its domestic legislation if it decides that such value is appropriate". GRSP concluded that the head restraint heights of 830 mm and 720 mm respectively could be finalized. The IWG decided to review the proposal accordingly and where appropriate to adapt the height requirements. For the rear centre seat, it was decided to retain the height of 700 mm.

(b) BioRID II

(i) List of items concerning the BioRID II: