Federal Motor Vehicle Safety Standards; Child Restraint Systems, Child Restraint Anchorage Systems, Incorporation by Reference
Published Date: 1/7/2025
Rule
Summary
This new rule makes car seat anchor points easier to use and helps parents install child seats correctly, making rides safer for kids. It affects car makers who must start adding these improved anchors to new vehicles by September 2028, with full compliance by 2030. Families can expect safer, simpler child seat setups without extra costs right away, but car makers have a few years to adjust.
Analyzed Economic Effects
7 provisions identified: 7 benefits, 0 costs, 0 mixed.
Vehicle Phase-in Dates for New Anchors
Vehicle manufacturers must begin phasing in the improved child-seat anchor requirements on September 1, 2028. The rule requires 20% of applicable vehicles from 9/1/2028–8/31/2029, 50% from 9/1/2029–8/31/2030, and 100% compliance on and after 9/1/2030; early compliance is allowed.
Lower Anchorage Usability Standards
The rule requires each lower anchorage to have a clearance angle of at least 54 degrees and an anchorage depth of 25 millimeters or less within the seat bight. These requirements are intended to make it easier to reach and attach child restraint lower connectors.
Tether Anchorage Location and Access Rules
Tether anchorages cannot be hidden under seats or vehicle components unless covered by a marked cover, and must lie outside a zone defined by a 325 mm radius sphere centered at the seat R-point truncated by a horizontal plane 230 mm below the sphere center; seats with fixed head restraints are exempt from the R-point distance requirement. These limits aim to ensure tethers can be tightened and accessed without removing parts.
Tether Anchorage Shape Standardized (With Exceptions)
The rule standardizes tether anchorages as a rigid bar (any cross-section shape) to improve recognition and use, but allows flexible anchorages (tether strap routing devices) for buses with GVWR ≤ 4,536 kg (10,000 lb) and for vehicle seating positions where the allowable tether zone is accessible only by removing a seating component. This preserves usability in vehicles with space limits.
Limit on Tether Hook and Hardware Length
Child restraint systems must limit the top tether hook and attachment hardware length as proposed in the rulemaking; the NPRM proposed a 165 millimeter (6.5 inch) maximum length and the final rule adopts the tether-length limitation as proposed. This is intended to make the tether tightening mechanism usable in the space around an anchorage.
Standard ISO Markings on Vehicles and Seats
Vehicles and child restraints must use a standardized ISO symbol to mark lower anchorages and tether anchorages so caregivers can match symbols on the vehicle and the child restraint. NHTSA estimates the marking cost per set of lower anchorages is $0.07 and $0.03 for the tether anchorage, with total incremental marking costs of about $760,000 for vehicles and $970,000 for child restraint connectors.
No Immediate Material Cost Increase Expected
NHTSA estimates the adopted requirements will not increase material costs and expects redesigns can be done within normal design cycles; the agency provided a 3-year phase-in to reduce tooling and cost burdens. This means families should not face immediate higher costs for child-seat anchors due to this rule.
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