Document ID: chunk:federal_register_of_legislation:F2017L01344:body:0:p6
Version: federal_register_of_legislation:F2017L01344
Segment Type: other
Provision Reference: 
Character Range: 16566–19352

a manner that the vertical plane of symmetry of the seat forms an angle of 90° (±10°) with the vertical plane of symmetry of the vehicle;
2.4. "Bench seat" means a structure complete with trim, intended to seat more than one adult person;
2.5. "Anchorage" means the system by which the seat assembly is secured to the vehicle structure, including the affected parts of the vehicle structure;
2.6. "Adjustment system" means the device by which the seat or its parts can be adjusted to a position suited to the morphology of the seated occupant. This device may, in particular, permit:
2.6.1. Longitudinal displacement;
2.6.2. Vertical displacement;
2.6.3. Angular displacement;
2.7. "Displacement system" means a device by which the seat or one of its parts can be displaced and/or rotated, without a fixed intermediate position, to permit easy access of occupants to the space behind the seat concerned;
2.8. "Locking system" means a device ensuring that the seat and its parts are maintained in the position of use;
2.9. "Folding seat" means a seat, which is normally folded, can be easily operated and is designed for occasional use by an occupant;
2.10. "Transverse plane" means a vertical plane perpendicular to the median longitudinal plane of the vehicle;
2.11. "Longitudinal plane" means a plane parallel to the median longitudinal plane of the vehicle;
2.12. "Head restraint" means a device whose purpose is to limit the rearward displacement of an adult occupant's head in relation to his torso in order to reduce the danger of injury to the cervical vertebrae in the event of an accident;
2.12.1. "Integrated head restraint" means a head restraint formed by the upper part of the seat‑back. Head restraints meeting the definitions of paragraphs 2.12.2. or 2.12.3. below but which can only be detached from the seat or the vehicle structure by the use of tools or by partial or complete removal of the seat covering, meet the present definition;
2.12.2. "Detachable head restraint" means a head restraint consisting of a component separable from the seat designed for insertion and positive retention in the seat‑back structure;
2.12.3. "Separate head restraint" means a head restraint consisting of a component separate from the seat, designed for insertion and/or positive retention in the structure of the vehicle;
2.13. "R point" means the seating reference point as defined in Annex 3 to this Regulation;
2.14. "Reference line" means the line on the manikin reproduced in Annex 3, Appendix 1, Figure 1, to this Regulation.
2.15.  "Partitioning system" means parts or devices which, in addition to the seat-backs, are intended to protect the occupants from displaced luggage; in particular, a partitioning system may be constituted by netting or wire mesh located above the