Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 165 - SLOW-MOVING VEHICLE IDENTIFICATION EMBLEM
Section 165.5 - Performance requirements

(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 98% before test. After durability test, § 165.6(b) (relating to test procedures), the dominant wave length of the fluorescent material shall not change more than 10%.

(2) The reflective material shall have minimum intensity values at each of the angles listed in Table 1. After durability test, § 165.6(b), the minimum reflective intensity values for the reflective material shall not change more than 20% from the values specified in Table 1.

TABLE 1 - MINIMUM REFLECTIVE INTENSITY VALUES, R*

*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 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 minimum dimension. The reflective intensity (R) is computed from the equation.

Click to view image

where

R = reflective intensity, candlepower per incident foot-candle per square foot

Lr = illumination incident upon receiver at observtion 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 (100 ft. as specified in SAE J594), feet

A = area of test surface, square feet

(1) The reflective and fluorescent materials shall be tough, flexible, and of sufficient thickness and strength to meet the requirements of this section and § 165.6. After the durability test, § 165.6(b), the fluorescent and reflective material shall show no appreciable discoloration, cracking, blistering, loss of durable bond or dimensional change.

(2) Backing material for portable identification emblems shall be equivalent to 0.040 inch (1.02 millimeter) minimum thickness aluminum, 22-gage (0.030 inch or 0.76 millimeter 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.

(3) These requirements shall be minimal and shall not preclude the use of materials having superior performance.