Interpretation ID: nht94-7.42

DATE: March 16, 1994

FROM: John Womack -- Acting Chief Counsel, NHTSA

TO: Angela R. Caron (Meridian, MS)

TITLE: None

ATTACHMT: Attached to letter dated 9/17/93 from Angela R. Caron to Office of Chief Counsel, NHTSA (OCC 9119)

TEXT:

This responds to your letter asking about the safety of aftermarket belt positioning devices. The devices you ask about alter the positioning of vehicle lap and shoulder belts, for the advertised purposes of improving the fit of the belts on children and small adults.

Although NHTSA understands your view that safety belts should be comfortable for the wearer, we have significant concerns about aftermarket belt positioning devices. The following discussion explains those concerns and the effect of our regulations on such products.

By way of background information, the National Traffic and Motor Vehicle Safety Act (the Safety Act) gives this agency the authority to issue safety standards applicable to new motor vehicles and new items of motor vehicle equipment. This agency does not have a safety standard that directly applies to belt positioning devices. Our safety standards for "Occupant Crash Protection," (Standard No. 208) and "Seat Belt Assembly Anchorages" (Standard No. 210) apply to new, completed vehicles. In addition, our safety standard for "Seat Belt Assemblies" (Standard No. 209) applies to new seat belt assemblies. Because a belt positioning device is neither installed as part of a completed vehicle nor as part of a seat belt assembly, none of these regulations apply to belt positioning devices.

While none of these standards applies to a belt positioning device, the manufacturer of the product is subject to the requirements of the Safety Act concerning the recall and remedy of products with defects related to motor vehicle safety. To date, there have been no defect proceedings concerning these products. In addition, while it is unlikely that a belt positioning device would be installed by a motor vehicle manufacturer, distributor, dealer or repair business, the Safety Act prohibits those businesses from installing the device if the installation "rendered inoperative" compliance with any safety standard.

Belt positioning devices raise safety concerns you should consider in deciding whether to use these products. These devices could be used in a way that significantly affects crash forces on the occupant. Standard No. 208 includes requirements that have the effect of ensuring that the lap and shoulder belts distribute the crash forces to the occupant's skeletal structure, a part of the body that can better withstand the forces. For example, Standard No. 208 requires the shoulder belt and the lap belt to intersect off of the abdominal area. A device that moved that intersection from the side to the middle of the abdomen could greatly increase the loading on the occupant's abdomen. An increase in abdominal loading could have serious safety implications for the wearer of the belt.

There are other concerns about these devices. The realigning of the shoulder belt could increase the likelihood that the wearer would twist toward the middle of the vehicle in a crash, so that the person could be partially or completely unrestrained by the shoulder belt. In addition, if the device introduced excessive slack into the belt system, the occupant's head would be more likely to contact the vehicle interior. Also, slack in the belt system generally introduces higher crash forces, which increase the risk of injury. We urge you to consider these factors when deciding whether to use a belt positioning device, or the manner in which to use one.

You also asked whether a "travel vest" can be used with your two and a half year old son, in place of a child seat. The travel vest is a "child restraint system" and is thus subject to our safety standard for child restraints (Standard No. 213). The manufacturer of the travel vest (which the standard refers to as a "harness") is responsible for determining the conformance of the vest to the requirements of Standard No. 213, and certifying that the vest so conforms. This agency periodically tests products for compliance with Standard No. 213. When properly used, harnesses that comply with Standard 213 provide good protection in a crash, similar to that provided by child seats. You should always follow the manufacturer's instructions for using the child restraint system, including the specifications for the weight of the child for whom the restraint is recommended.

I hope this information is helpful. If you have further questions, please feel free to contact Mary Versailles of my staff at (202) 366-2992.