# Title 37 — Department of Transportation

## Article 37-02 — Slow-Moving Vehicle Identification Emblem

## Chapter 37-02-01 — Design and Specification

### § 37-02-01-01. Facing material.

The identification emblem (see Figure 1) consists of a fluorescent yellow-orange triangle with a
dark red reflective border. The yellow-orange fluorescent triangle is for daylight identification. The
reflective border defines the shape of the fluorescent color in daylight and becomes a hollow red
triangle in the path of motor vehicle headlights at night.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-02. Visibility.

The emblem shall be entirely visible in daylight and at night from all distances between six hundred
feet and one hundred feet [182.88 meters to 30.48 meters] from the rear when directly in front of lawful
upper beam of headlamps.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-03. Color values.

The spectrophotometric color values of the yellow-orange fluorescent material shall have a
dominant wave length of five hundred ninety to six hundred ten millimicrons and a purity of ninety-eight
percent before test. After the durability test under section 37-02-01-08, the dominant wave length of the
fluorescent material shall not change more than ten percent.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-04. Minimum reflective values.

The reflective material shall have minimum intensity values at each of the angles listed in this
section. After the durability test under section 37-02-01-08, the minimum reflective intensity values for
the reflective material shall not change more than twenty percent from the values specified in this
section.

Divergence Incidence Reflective
Angle, degrees Angle, degrees Intensity, R
0.2 0 10
0.2 15 7
0.2 30 5
0.5 0 5
0.5 15 4
0.5 30 2
* Measurements shall be conducted in accordance with photometric testing procedures
for reflex-reflectors as specified in Society of Automotive Engineers Standard, SAE J594,
Reflex Reflectors, and using fifty, plus or minus five square inches [322.6, square
centimeters] of reflective material. The maximum dimension of the test surface shall not
be greater than one and one-half times the minimum dimension. The reflective intensity
(R) is computed from the equation.
(Lr) (d2)
R = (Ls) (A)
Where:
R = reflective intensity, candlepower per
incident foot-candle per square foot.
Lr = illumination incident upon receiver at
observation point foot-candles
Ls = illumination incident upon a plane
perpendicular to the incident ray at the
test specimen position, foot-candles.
d = distance from test specimen to source of
illumination one hundred feet (specified in
A = area of test surface, square feet.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-05. Material strength.

The reflective and fluorescent materials shall be tough, flexible, and of sufficient thickness and
strength to meet the requirements of sections 37-02-01-02 through 37-02-01-10. After the durability test
under section 37-02-01-08, the fluorescent and reflective material shall show no appreciable
discoloration, cracking, crazing, blistering, loss of durable bond, or dimensional change.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50

### § 37-02-01-06. Backing material.

Backing material for portable emblems shall be equivalent to four-hundredths of an inch [1.016
millimeters] minimum thickness aluminum, 22 gage [.03 inches or 0.762 millimeters] minimum
thickness mill-galvanized or coated sheet steel with the surface clean and receptive to a durable bond.
The backing material shall be free of burrs. Any material equal to or superior to these requirements may
be utilized.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-07. Testing standards.

The emblem shall be tested in conformance with the following sections from SAE J575, Tests for
Motor Vehicle Lighting Devices and Components:
Section B - Samples for Tests
Section D - Laboratory Facilities
Section E - Vibration Test
Section H - Corrosion Test (pertains to face of
emblem only)
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-08. Durability test.

Samples shall be exposed to the sun at an angle of forty-five degrees to horizontal and facing
south per American Society for Testing and Materials, ASTM D 1014, Method of Conducting Exterior
Exposure Tests of Paints on Steel.
Minimum Test Period, months:
Location Fluorescent Reflective
Outside in Midwest or 12 24
outside in Miami, Florida 6 12
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-09. Replacement of fluorescent material.

The yellow-orange fluorescent material in the center of the emblem shall be replaced when not
visible in normal sunlight for a distance of six hundred feet [182.88 meters]. The red fluorescent
material shall be replaced when not visible at night for a distance of six hundred feet [182.88 meters]
when directly in front of lawful upper beam of headlight.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
### § 37-02-01-10. Strength test.

Each test sample shall be dropped from a height of five feet [1.53 meters] to a smooth, hard
surface equivalent to rigid metal or concrete. Each test sample shall be submitted to three drop tests:

corner drop, edge drop, and flat drop. Failure shall be considered to have occurred when the emblem
will no longer meet requirements in section 37-02-01-03.
General Authority: NDCC 39-21-50
Law Implemented: NDCC 39-21-50
