West Virginia Code of State Rules › Agency 91 - Motor Vehicles › Title 91 - LEGISLATIVE RULE DIVISION OF MOTOR VEHICLES › Series 91-11 - Motor Vehicle Equipment › Section 91-11-4 - Slow Moving Vehicles

Current through Register Vol. XLI, No. 28, July 12, 2024
4.1. W.
				Va. Code '17C-6 requires all farm machinery, except when guarded by flagman or
				flashers, designed to operate at twenty-five (25) m.p.h. or less, traveling on
				a public highway, during day or night, to display a triangular slow moving
				emblem on the rear of the vehicle.
4.2. The purpose of this legislation is to
				create a unique identification emblem to be installed as a safety feature on
				slow moving vehicles when operated or traveling (transported) on public
				highways amidst motor vehicles designed for high speed. The short form of
				designation of such vehicle shall be SMV.
4.3. The Commissioner, as authorized by the
				provisions of this act, adopts the SMV emblem as described in the American
				Society of Agriculture Engineers S276.2 as the official slow moving vehicle
				emblem of West Virginia.
4.4. The
				standards and specifications for design and position of mounting the SMV emblem
				and requirements for certification of conformance as adopted by the
				Commissioner of Motor Vehicles in conjunction with the American Society of
				Agricultural Engineers Standard S276.2 are as outlined in the following
				sections:
4.5. Specifications and
				Standards.
4.5.a. The SMV emblem shall
				consist 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 flourescent color in daylight
				and becomes a hollow red triangle in the path of motor vehicle headlights at
				night. The emblem shall meet the following specifications:
4.5.b. Size. The dimensions shall be shown in
				Figure 1. (See Figure 1 Identification Emblem.)
4.5.c. Visibility. The SMV emblem shall be
				entirely visible in daylight and at night from all distances between six
				hundred (600) feet and one hundred (100) feet from the rear when directly in
				front of lawful upper beam of headlights. The operator and/or owner of a
				slow-moving vehicle shall exercise due care in the maintenance and cleaning of
				the emblem to assure it being plainly visible.
4.5.d. Color and reflectivity
4.5.d.1. The spectrophotometric color values
				of the yellow-orange fluorescent material shall have a dominant wave length of
				590 - 610 millimicrons and a purity of ninety-eight percent (98%) before test.
				After durability test, the dominant wave length of the fluorescent material
				shall not change more than ten percent (10%).
4.5.d.2. The reflective material shall have
				minimum intensity values at each of the angles listed per Table 1. After
				durability test, the minimum reflective intensity values for the reflective
				material shall not change more than twenty percent (20%) from the values
				specified in Table 1.
TABLE 1
MINIMUM REFLECTIVE INTENSIVE VALUES
DIVERGENCE
INCIDENCE
REFLECTIVE
ANGLE, DEG
ANGLE, DEG
INTENSITY,
						  R
0.2 0
10
0.2 15
7
0.2 30
5
0.5 0
5
0.5 10
4
0.5 30
2
1Measurements 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 50 " 5 sq. in (322.6 " 32.3 sq. centimeters) of
				  reflective material. The maximum dimension of the test surface shall not be
				  greater than 1.5 times the minium dimension. The reflective intensity (R) is
				  computed from the equation:
R = (Lr) (d2 ) / (Ls) (A)
R = reflective intensity, candlepower per incident
				  foot-candle per squar foot
Lr = illumination incident upon receiver at observation
				  point, foot-candles
Ls = illumination incident upon a plate perpendicular to the
				  incident ray at the test specimen position, foot candles
d = distance from test specimen to source of illumination
				  one hundred (100) feet as specified in SAEJ594), feet
A = area of tests surface, square feet.
4.5.E. Durability. (Note: These
				requirements are minimum and do not preclude the use of materials having
				superior performance.)
4.5.E.1. The reflective
				and fluorescent materials shall be tough, flexible and of sufficient thickness
				and strength to meet the requirements of Sections 4.5 and 4.6. After the
				durability test, the fluorescent and reflective material shall show no
				appreciable discoloration, cracking, blistering, loss of durable bond or
				dimensional change.
4.5.E.2.
				Backing material for portable SMV emblems shall be equivalent to 0.040 in.
				(0.1016 millimeters) minimum thickness aluminum, 22-gage (0.030 in. Or 0.76 mm)
				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.