Current through Register Vol. 54, No. 44, November 2, 2024
(a)
Equipment. Requirements for equipment shall be as follows:
(1) Reflex reflective material and
fluorescent material that meet the requirements of this chapter shall be
affixed to both faces of the warning device. Alternatively, a dual purpose
orange fluorescent and red reflective material that meets the requirements of
this chapter, referred to in this chapter as dual purpose material, may be
affixed to both faces in places of the reflective and fluorescent
materials.
(2) Each warning device
shall be protected from damage and deterioration by one of the following:
(i) By enclosure in an opaque protective
reusable container, except that two or three warning devices intended to be
sold for use as a set with a single vehicle may be enclosed in a single
container.
(ii) By secure
attachment to any light-tight, enclosed, and easily accessible compartment of a
new motor vehicle with which it is supplied by the vehicle
manufacturer.
(3) The
warning device shall be designed to be erected, and replaced in its container,
without the use of tools.
(4) The
warning device shall be permanently and legibly marked with all of the
following:
(i) Name of manufacturer.
(ii) Month and year of manufacture, which may
be expressed numerically, as "6/72."
(iii) The symbol "DOT," or the statement that
the warning device complies with all applicable Federal motor vehicle safety
standards.
(5) Each
warning device shall have instructions for its erection and display:
(i) The instructions shall be either
indelibly printed on the warning device or attached in such a manner that they
cannot be easily removed.
(ii)
Instructions for each warning device shall include a recommendation that the
driver activate the vehicular hazard warning signal lamps before leaving the
vehicle to erect the warning device.
(iii) Instructions shall include the
illustration depicted in Figure 3 of Appendix A indicating recommended
positioning.
(b)
Configuration.
Configuration requirements shall be as follows:
(1) When the warning device is erected on
level ground:
(i) Part of the warning device
shall form an equilateral triangle that stands in a plane not more than ten
degrees from the vertical, with the lower edge of the base of the triangle
horizontal and not less than one inch above the ground.
(ii) None of the required portion of the
reflective material and fluorescent material shall be obscured by any other
part of the warning device except for any portion of the material over which it
is necessary to provide fasteners, pivoting beads, or other means to allow
collapsibility or support of the device. In any event, sufficient reflective
and fluorescent material shall be used on the triangle to meet the requirements
of subsections (d) and (e).
(2) Each of the three sides of the triangular
portion of the warning device shall not be less than 17 and not more than 22
inches long, and not less than two and not more than three inches wide, Figure
1 of Appendix A.
(3) Each face of
the triangular portion of the warning device shall have an outer border of red
reflex reflective material of uniform width and not less than 0.75 and not more
than 1.75 inches wide, and an inner border of orange fluorescent material of
uniform width and not less than 1.25 and not more than 1.30 inches wide, Figure
1 of Appendix A. However, this requirement shall not apply if the dual purpose
material is used.
(4) Each vertex
of the triangular portion of the warning device shall have a radius of not less
than 0.25 inch and not more than 0.50 inch.
(5) All edges shall be rounded or chamfered,
as necessary, to reduce the possibility of cutting or harm to the
user.
(6) The device shall consist
entirely of the triangular portion and attachments necessary for its support
and enclosure, without additional visible shapes or attachments.
(c)
Color.
Requirements for color are as follows:
(1) The
color of the red reflex material on the warning device shall have the following
characteristics, both before and after the warning device has been conditioned
in accordance with §
163.6(a)
(relating to test procedures), when the source of illumination is a lamp with a
tungsten filament operating at 2856° Kelvin color temperature. Expressed in
terms of the International Commission on Illumination (CIE) 1931 standard
colorimetric observer system, CIE chromaticity diagram, Figure 4 of Appendix A,
the chromaticity coordinates of the red reflex reflective material shall lie
within the region bounded by the spectrum locus and the lines on the diagram
defined by the following equations:
| Boundary
| Equations
|
| Yellow | y = 0.33 |
| White | x + Y = 0.98 |
(2) The color of the orange fluorescent
material on the warning device shall have the following characteristics, both
before and after the warning device has been conditioned in accordance with
§
163.6(a)
(relating to test procedures), when the source of illumination is a 150 watt
high pressure xenon compact arc lamp. Expressed in terms of the International
Commission on Illumination (CIE) 1931 standard colorimetric observer system,
the chromaticity coordinates of the orange fluorescent material shall lie
within the region bounded by the spectrum locus and the lines on the diagram
defined by the following equations:
| Boundary
| Equations
|
| Yellow | Y = 0.49 x 0.17 |
| White | x + y = 0.93 |
| Red | y = 0.35 |
The 150-watt high pressure xenon compact arc lamp shall
illuminate the sample using the unmodified spectrum at an angle of incidence of
45° and an angle of observation of 90°. If dual purpose material is
being tested, it shall be illuminated by a 150 watt high pressure xenon compact
arc lamp, whose light is diffused by an integrating sphere.
(d)
Reflectivity.
When the red reflex reflective material on the warning device is tested in
accordance with §
163.6(b), both
before and after the warning device has been conditioned in accordance with
§
163.6(a), its
total candlepower per incident foot candle shall be not less than the values
specified in Table I of Appendix A of this chapter for each of the listed
entrance angles.
(e)
Luminance. When the orange fluorescent material on the warning
device is tested in accordance with §
163.6(c), both
before and after the warning device has been conditioned in accordance with
§
163.6(a), it
shall have a minimum relative luminance of 25% of a flat magnesium oxide
surface and a minimum product of that relative luminance and width in inches of
44.
(f)
Stability.
When the warning device is erected on a horizontal brushed concrete surface
both with and against the brush marks and subjected to a horizontal wind of 40
miles per hour in any direction for 3 minutes all of the following apply:
(1) No part of it shall slide more than 3
inches from its initial position.
(2) Its triangular portion shall not tilt to
a position that is more than 10° from the vertical.
(3) Its triangular position shall not turn
through a horizontal angle of more than 10° in either direction from the
initial position.
(g)
Durability. When the warning device is conditioned in
accordance with §
163.6(a), no part
of the warning device shall become warped or separated from the rest of the
warning device.
