[Federal Register Volume 63, Number 43 (Thursday, March 5, 1998)]
[Notices]
[Pages 10964-10965]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-5743]
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DEPARTMENT OF TRANSPORTATION
National Highway Traffic Safety Administration
[Docket No. NHTSA-98-3558]
Fleetwood Enterprises, Inc.; Action on Application for Decision
of Inconsequential Noncompliance
This document grants in part and denies in part the application by
Fleetwood Enterprises, Inc. (Fleetwood) of Riverside, California for a
determination that the failure of glazing to comply with the light
transmittance requirements of 49 CFR 571.205, Federal Motor Vehicle
Safety Standard No. 205, ``Glazing Materials,'' is inconsequential to
safety. The glazing was installed in certain motor homes manufactured
by Fleetwood.
Notice of receipt of the application was published on June 16, 1997
(62 FR 32676) and an opportunity for comment was afforded.
Standard No. 205 incorporates by reference the American National
Standards Institute's (ANSI) ``Safety Code for Safety Glazing Materials
for Glazing Motor Vehicles Operating on Land Highways'' Z-26.1-1977,
January 26, 1977, as supplemented by Z26.1a, July 3, 1980 (ANS Z26.1).
This specifies that glazing materials used in windshields and in
windows to the immediate right and left of the driver of trucks and
buses shall have a luminous transmittance of not less than 70 percent
of the light, at normal incidence, when measured in accordance with
``Light Transmittance, Test 2'' of ANSI Z-26.1-1980. (It also specifies
that all windows of an automobile shall have a luminous transmittance
of not less than 70 percent.)
From July 1995 through January 1997, Fleetwood manufactured
approximately 1,438 1996 and 1997 model year Flair brand motor homes
having front side windows with a luminous transmittance of 62 percent
and approximately 188 Bounder brand motor homes and 733 Discovery brand
motor homes, also of model years 1996 and 1997, having double panes of
the same glazing in the front side windows. Fleetwood reported a
luminous transmittance of 41 percent for the dual pane application.
Beginning with vehicle production in January 1997, front side windows
with a luminous transmittance of greater than 70 percent have been
installed in all Fleetwood motor homes.
Fleetwood supported its application for inconsequential
noncompliance with the following:
Fleetwood considered a Ford Motor Company inconsequentiality
petition that references computer modeling studies and in-car
evaluations conducted by Ford Motor Company that were used in their
petition dated February 6, 1995 which showed a 5 point reduction in
the percentage of light transmission, from 65 to 60 percent,
resulted in a reduction of seeing distance of only 1 to 2 percent
during night time driving, and little or no reduction in seeing
distance during dusk and daytime driving. Based on these studies,
the subject Flair brand motor home driver and passenger side windows
with 62 percent light transmittance would be expected to result in
no significant reduction in seeing distance during night time
driving and virtually no reduction during dusk and daytime driving,
compared to glass with a 70 percent transmittance. Reductions in
seeing distances of 1 percent or less have no practical or
perceivable effect on driver visibility based on observer's reports
in vehicle evaluations by Ford of windshields with line-of-sight
transmittance in the 60 to 65 percent range. The subject Bounder and
Discovery brand motor home driver and passenger side windows with 41
percent light transmittance would be expected to result in no
significant reduction in seeing distances during night time driving,
and little to no reduction in seeing distance during dusk and
daytime driving.
Fleetwood also considered that the stated purpose of Standard
No. 205 to which the light transmittance requirements are directed
is `to ensure a necessary degree of transparency in motor vehicle
windows for driver visibility.' NHTSA, in its March 1991 `Report to
Congress on Tinting of Motor Vehicle Windows', concluded that the
light transmittance of windows of the then new passenger cars and
vans that complied with Standard No. 205 did not present an
unreasonable risk of accident occurrence. The new passenger cars and
vans that were considered to not present an unreasonable risk had
effective line-of-sight light transmittances through the windshields
as low as approximately 63 percent on passenger car windshields and
55 percent on van windshields (as determined by a 1990 agency
survey, the results of which were included in the Report to
Congress). Fleetwood feels that while light transmittance and driver
visibility through front side windows is important to the safe
operation of motor homes, it is not as important as driver
visibility through motor
[[Page 10965]]
home windshields. Therefore, while the use of front side window
glazing with luminous transmittance less than 70 percent is
technically a non-compliance, we believe the condition presents no
risk to motor vehicle safety.
Fleetwood's opinion that this non-compliance is not safety
related is also based upon the consideration of the great amount of
visibility that is inherent in the driver packaging of the subject
motor homes. Factors which contribute to this visibility are:
1. The windshield glass is approximately 100 inches wide by 36
inches tall.
2. The windshield glass is installed at an incidence angle of 4
degrees back from vertical.
3. The involved side window glass on the Flair and Bounder brand
motor homes is approximately 46 inches long by 31 inches tall. The
involved side window glass on the Discovery brand motor home is
approximately 52 inches long by 34 inches tall.
4. The involved side window glass is flat and is installed
perpendicular to the ground.
5. The driver's seat H point ranges from approximately 50 to 62
inches from the ground.
6. The involved windows have a slider feature which allows them
to be positioned out of line of sight (if desired), and
7. Side window visibility is primarily key in sharp turning
maneuvers which are typically performed at low speeds.
No comments were received on the application.
NHTSA has reviewed Fleetwood's application and, for the reasons
discussed below, concludes that the noncompliance of the Flair motor
homes with a front side window light transmittance of 62 percent is
inconsequential to motor vehicle safety. However, it denies the
application with respect to the noncompliances of the Discovery and
Bounder motor homes with a front side window light transmittance of 41
percent.
Fleetwood's argument was based in part on information from a
similar inconsequentiality application from Ford Motor Company
(``Ford'') demonstrating that there is only a small effect upon seeing
distance of a decline in light transmittance from 65 to 60 percent.
Ford also cited a NHTSA report to Congress that the rake angle of
certain windshields reduces the effective transmittance of light to 63
percent in some automobiles and to 55 percent in a particular minivan.
(Ford's application involved 8,250 1995 Lincoln Continental passenger
cars whose front door windows had a luminous transmittance of
approximately 68 percent.) The application was granted (60 FR 31345) on
June 14, 1995. Although a windshield might have the requisite minimum
of 70 percent transmittance when tested in a vertical position, its
rake angle as installed reduces the light transmittance below 70
percent, and to 63 percent on some passenger cars, without creating a
noncompliance with Standard No. 205. Given that fact, NHTSA has
concluded that a value of 62 percent transmittance of the side windows
on Flair motor homes is inconsequential to safety.
However, the agency cannot make the same finding with respect to
the Discovery and Bounder motor homes where double pane glass has
reduced the light transmittance to a reported 41 percent. Fleetwood
characterized the role of front side windows as ``primarily key in
sharp turning maneuvers which are typically performed at low speeds''
and to expect no significant reduction in night time seeing distances
with windows having a light transmittance of 41 percent (Fleetwood
derives the 41 percent transmittance value from a double pane
application of the 62 percent transmittance windows. However, the
agency believes that it is closer to 38.4 percent).
NHTSA cannot accept Fleetwood's assertion that the noncomplying
glazing material in the Discovery and Bounder motor homes is
inconsequential. The previously mentioned report to Congress discusses
a research study which included glazing of 40 percent transmittance
(Rompe and Engel, ``The Influence of Windshields with Lower Light
Transmission in Driver's Vision During Night Driving,'' SAE Technical
Paper 870062). The study found 25 to 35 percent reductions in the
ability of subjects to detect low contrast targets in simulated
twilight driving when 40 percent transmittance glazing was substituted
for 76 percent transmittance glazing. NHTSA also believes that side
window visibility has a much greater safety role than in simply
supplementing the large windshield of a motor home in low speed
turning. Clear side window visibility is necessary in times of darkness
for the driver to use the outside rear view mirrors and to have direct
side vision at intersections and in lane change maneuvers.
Accordingly, for the reasons discussed above, it is hereby found
that the applicant has met its burden of persuasion that the
noncompliance of Flair motor homes with the requirements of 49 CFR
571.205 for light transmittance in front side window glazing is
inconsequential to safety. However, it is also hereby found that the
applicant has not met this burden of persuasion with respect to the
noncompliance of Discovery and Bounder motor homes with the
requirements of 49 CFR 571.205 for light transmittance in front side
window glazing, and its application is denied.
(49 U.S.C. 30108, 30120; delegations of authority at 49 CFR 1.50 and
501.8)
Issued on: March 2, 1998.
L. Robert Shelton,
Associate Administrator for Safety Performance Standards.
[FR Doc. 98-5743 Filed 3-4-98; 8:45 am]
BILLING CODE 4910-59-P
