Interpretation ID: nht94-8.7

DATE: February 21, 1994

FROM: Thomas D. Turner -- Manager, Engineering Services, Blue Bird Body Company

TO: John Womack -- Acting Chief Counsel, NHTSA

COPYEE: Richard Kuykendall -- 3M

TITLE: 49 CFR Part 571.217; Docket No. 88-21; Notice No. 3; Federal Motor Vehicle Safety Standard 217; Bus Emergency Exits and Window Retention and Release; Federal Register Vol 57, No. 212, Monday, November 2, 1992

ATTACHMT: Attached to letter dated 3/28/94 from John Womack to Thomas D. Turner (A42; Std. 217)

TEXT:

Section S5.5.3(c) of the referenced final rule requires that:

"Each opening for a required emergency exit shall be outlined around its outside perimeter with a minimum 3 centimeters wide retro-reflective tape, either red, white or yellow in color that when tested under the conditions specified in S6.1 of 571.131, meets the criteria specified in Table 1."

In a May 17, 1993 letter, Blue Bird requested the following interpretations regarding the requirements of Section S5.5.3(c):

"Blue Bird requests interpretations that the tape outlining the perimeter of the exit shall be installed such that the edge of the tape closest to the emergency exit opening is not greater than 6 inches from the edge of the opening and that splits, interruptions, discontinuities and holes in the tape are allowed to avoid and/or accommodate rivets, rubrails, hinges, handle, curved surfaces, and other function components located around the exit opening."

In support of this request, the letter stated --

"The retro-reflective tape commercially available for this application is stiff and will not conform to rivet heads, curved surfaces, and other discontinuities. It must be located to avoid rivets, rubrails, hinges, or curved surfaces and/or must have relief holes punched in it to allow installation over rivet heads."

Your response to our May 17, 1993 letter dated July 7, 1993 documented a telephone conversation between Mary Versailles of your staff and myself in which I provided the following additional information in support of our request:

"In a June 22, 1993 phone conversation with Mary Versailles of my staff, you explained that applying the retro-reflective tape over rivets, rubrails, hinges, and other irregular surfaces would result in raised areas of the tape." You believe these raised areas would allow dirt and moisture to get under the tape and eventually result in the lifting of all or most of the tape. You also explained that you believed it was preferable to place the retro-reflective tape adjacent to rivets (as is seen in the photographs you enclosed of the roof exit viewed from the front of the bus), rather than punching holes in the tape to accommodate the rivets (as in the pictures of the rear pushout window or

rear door), for two reasons. First you explained that the tape is placed on the bus as one of the last steps in manufacturing a bus. If the tape must be placed over rivet, holes must be punched in the tape and the tape positioned over the rivets, which results in a very labor intensive process. Second, you explained that the edges of the tape are sealed to prevent raveling. Since holes punched into the tape for the rivets are not sealed, these holes make it easier for the tape to wear and peel off."

Your response of July 7, 1993 provided the following interpretations:

"NHTSA interprets S5.5.3(c) to allow interruptions in the tape necessary to avoid and/or accommodate curved surfaces and functional components, such as rivet, rubrails, hinges and handles, provided, however, that the following requisites are met. In the November 2, 1992 final rule, NHTSA indicated that the purpose of the retro-reflective tape would be to identify the location of emergency exits to rescuers and increase the on-the-road conspicuity of the bus. Accordingly, the retro-reflective tape may have interruptions if they satisfy both of these purposes. The occasional breaks in the tape you described would not appear to negatively affect a rescuer's ability to locate the exits, or reduce the conspicuity of the bus. However, the tape should be applied as near as possible to the exit perimeter. While we do not anticipate the nearest possible location for the tape to be further than your suggested distance of six inches from the exit, it seems that for most exits, the nearest possible location would be far less than six-inches."

Blue Bird sincerely appreciated the above timely and conscientious response which recognized the real world manufacturing problems we were facing and which provided reasonable flexibility in meeting the requirements while maintaining strict adherence to the requisites of the November 2, 1992 final rule. The above response enabled Blue Bird to design and incorporate into production acceptable retro-reflective tape installations for side door, side window, and roof emergency exits.

However, the installation of retro-reflective tape on the rear of the school buses is still a major problem because of the limited amount of area on the rear of school buses and the many features required by federal and state standards. These features include taillights, stop lights, turn signal lights, backup lights, license plate holder and light, reflectors, large windows, extended rubrails, exit door or windows, hinges, handles, labels, and a multitude of fasteners to meet FMVSS 221 School Bus Body Joint Strength.

Attached are two pages taken from our May 17, 1993 request for interpretation that illustrate these problems that require cutting, notching, and punching of holes in the tape around the rear school bus exits. Our supplier of retro- reflective tape, 3M, has been unable to provide us a product that is cut, notched, and/or punched with sealed edges that would help ensure the longevity, durability, and effectiveness of the retro-reflective tape. In order to provide ongoing safety, the retro-reflective tape must remain on the bus and retain its reflective properties. Without proper sealing of the holes and notches, the longevity of the tape is questionable.

Since January 1993, in order to enhance the conspicuity and thereby the safety of school buses, Blue Bird has been installing retro-reflective tape down the sides and around the perimeter of the rear of new school buses as part of

standard equipment. Attached are illustrations and an advertising flyer showing the standard equipment designs we have developed to minimize installation problems and maximize conspicuity of the vehicles. The materials and patterns used are compatible with the FMVSS 108 requirements NHTSA has established for large trailers. SINCE ALL SCHOOL BUSES ARE REQUIRED BY FMVSS 217 TO HAVE A REAR EMERGENCY EXIT, Blue Bird believes that outlining the rear perimeter of the buses rather than just the perimeter of the emergency exit opening is more practical, reasonable and in the best interest of safety. We, therefore, request an interpretation stating that RETRO-REFLECTIVE TAPE AROUND THAT PERIMETER OF THE REAR OF A SCHOOL BUS CAN BE USED TO SATISFY THE REQUIREMENTS OF S5.5.3(C). Such an interpretation would meet the intent of the November 2, 1992 final rule by allowing the retro-reflective tape to continue to satisfy the requisite of identifying the location of the rear emergency exits to rescuers while substantially improving its ability to increase the on- the-road conspicuity of the bus. We believe such an interpretation is also consistent with your July 7, 1993 interpretation which said "....the tape should be applied as near as possible to the exit perimeter." Based on the problems we are having on the rear of the school buses, we now consider the locations chosen for our standard equipment perimeter marking "AS NEAR AS POSSIBLE" to the exit perimeter.

Thank you for consideration of this request for interpretation. Our purpose in making this request is to enhance the effectiveness of the material we install to meet S5.5.3(c) and make school buses safer. The length, width, and total area of reflective tape we are proposing to install on the rear of school buses by requesting the above interpretation is significantly greater than what would be required to outline only the perimeter of the exit opening. The new FMVSS 217 requirements become effective May 2, 1994 and therefore an early and favorable response is urgently requested. We believe our request can be resolved with an interpretation because it is compatible with both the wording and the intent of the standard. If, however, it cannot be handled as an interpretation, we request that this letter be treated as a petition for rulemaking per 49 CFR Part 552. Thank you.

ATTACHMENTS

Illustrations omitted.