Add-on child restraint system means any portable child restraint system.
Belt-positioning seat means a child restraint system that positions a child on a vehicle seat to improve the fit of a vehicle Type II belt system on the child and that lacks any component, such as a belt system or a structural element, designed to restrain forward movement of the child's torso in a forward impact.
Car bed means a child restraint system designed to restrain or position a child in the supine or prone position on a continuous flat surface.
Child restraint anchorage system is defined in S3 of FMVSS No. 225 (§ 571.225 ).
Child restraint system is defined in S4 of FMVSS No. 213 (§ 571.213 ).
Contactable surface means any child restraint system surface (other than that of a belt, belt buckle, or belt adjustment hardware) that may contact any part of the head or torso of the appropriate test dummy, specified in S7, when a child restraint system is tested in accordance with S6.1.
Harness means a combination pelvic and upper torso child restraint system that consists primarily of flexible material, such as straps, webbing or similar material, and that does not include a rigid seating structure for the child.
Rear-facing child restraint system means a child restraint system that positions a child to face in the direction opposite to the normal (forward) direction of travel of the motor vehicle.
Seat orientation reference line or SORL means the horizontal line through Point Z as illustrated in Figure 1 to § 571.213a .
Tether anchorage is defined in S3 of FMVSS No. 225 (§ 571.225 ).
Tether strap is defined in S3 of FMVSS No. 225 (§ 571.225 ).
Torso means the portion of the body of a seated anthropomorphic test dummy, excluding the thighs, that lies between the top of the child restraint system seating surface and the top of the shoulders of the test dummy.
Table 1 to S5.1.6
Type of add-on child restraint system | Means of installation | |||
Type II seat belt assembly | Type II seat belt assembly plus a tether if needed | Lower anchorages of the child restraint anchorage system | Lower anchorages of the child restraint anchorage system plus a tether if needed | |
Rear-facing restraints | X | X | ||
Forward-facing restraints | X | X |
49 C.F.R. §571.213a