Interpretation ID: 1739y
Vice President - Engineering
Transportation Products Group
American Seating Company
901 Broadway, N.W.
Grand Rapids, MI 49504
Dear Mr. McDowell:
This responds to your recent letter asking this agency to "provide guidelines for the design and installation of seat belt assemblies on large buses (over 10,000 pounds GVW)." You explained that you were interested in this information for passenger seats of large buses used in transit service, not as school buses. I am happy to be able to explain our requirements to you.
Standard No. 208, Occupant Crash Protection (49 CFR /571.208) sets forth the crash protection requirements applicable to most vehicle types. Section S4.4 of that standard sets forth the requirements applicable to large buses other than school buses. That section requires large buses to have either a complete automatic protection system for the bus driver's seating position, or a seat belt assembly that conforms with Standard No. 209 at the driver's seating position. Standard No. 208 does not specify any requirements for either an automatic protection system or seat belt assemblies to be installed at any other seating positions in large buses.
Standard No. 210, Seat Belt Assembly Anchorages (49 CFR /571.210) also includes requirements applicable to the anchorages for any belt assemblies installed at the driver's seating position on large buses. Specifically, section S4.1.2 of Standard No. 210 provides that: "Seat belt anchorages for a Type 1 or Type 2 seat belt assembly shall be installed for each designated seating position, except a passenger seat in a bus or a designated seating position for which seat belt anchorages for a Type 2 seat belt assembly are required by S4.1.1." As with Standard No. 208, Standard No. 210 exempts passenger seats in large buses from its requirements.
Finally, Standard No. 209, Seat Belt Assemblies (49 CFR /571.209) sets forth requirements applicable to all seat belt assemblies for use in motor vehicles, including large buses. Thus, any seat belt assembly installed at the driver's position in a large bus would have to be certified as complying with Standard No. 209, as would any seat belt assembly voluntarily provided by a manufacturer for passenger seating positions in a large bus.
In short, our standards do not require seat belt assemblies to be installed in passenger seats of large buses, but any seat belt assemblies that are installed at those positions would have to comply with Standard No. 209. Your letter indicated that you were generally aware of the fact that seat belt assemblies were not required to be installed at passenger seating positions of large buses. Nevertheless, you asked us to provide you with "guidelines" for such installations, in response to the continuing demand for such installations by your company's customers. As a policy matter, NHTSA does not provide the sort of guidelines you have requested.
The National Traffic and Motor Vehicle Safety Act (15 U.S.C. 1381 et seq.) sets forth certain specific requirements that must be satisfied by each of the Federal motor vehicle safety standards established by this agency. Among these requirements are that each safety standard shall be practicable, meet the need for motor vehicle safety, and be stated in objective terms (section 103(a) of the Safety Act) and each standard shall be reasonable, practicable, and appropriate for the particular type of vehicle for which it is prescribed (section 103(f)(3) of the Safety Act). NHTSA has determined that the current requirements of Standards No. 208 and 210, which do not apply to passenger seats in large buses, meet all of the statutory criteria.
The issuance of "guidelines" specifying measures beyond those required by our standards could readily be misinterpreted as an agency decision that these additional measures are necessary to satisfy the criteria of the Safety Act, or indirectly force manufacturers to comply with the "guidelines," in addition to the standards issued under the Safety Act. Either or both of these results would be inappropriate for passenger seats on large buses, because the information currently available to NHTSA indicates that no additional requirements are necessary in this area.
Indeed, if the agency were to learn of additional information suggesting the current requirements no longer meet all the statutory criteria, and that requirements for the installation of seat belt assemblies at passenger seats of large school buses would meet all the statutory criteria, we would have an obligation to consider changing the applicable standards. Any such change would be required to be made through the ordinary, notice-and-comment rulemaking process, rather than through issuance of supplemental guidelines.
I hope this information is helpful.
Sincerely,
Erika Z. Jones Chief Counsel
/ref:208#209#210 d:3/22/89