This document classifies the spatial requirements in a vehicle to enable a child restraint system (CRS)
to be conveniently mounted. It also specifies the dimensions of child restraint systems, to ensure that
they will fit in vehicles.
A classification scheme is provided to determine dimensional compatibility between child restraint
systems and the available space at specified seating positions in vehicles. The dimensional requirements
refer to forward-facing child restraint systems of three size categories, rearward-facing child restraint
systems of three size categories, and lateral-facing child restraint systems of two categories. This
edition of the document also incorporates size classification of booster systems.