Neb. Admin. Code EDUCATION, DEPARTMENT OF, tit. 92, ch. 92, app F
DAYTIME COLOR SPECIFICATION PROPOSAL
The daytime color of the RETRO REFLECTIVE sheeting used to enhance school bus safety requires different color tolerances in order to assure optimum safety benefit as well as to be consistent with the color of the school bus.
The color of the RETRO REFLECTIVE sheeting shall conform to the table below when samples applied to aluminum test panels are measured as specified in ASTM E1164. For colorimetric measurements, material is illuminated by Standard Illuminant D65 at an angle of 45 degrees with the normal to the surface the observations are made in the direction of the normal (45/0 degree geometry). The inverse (0/45 degree geometry) with the illuminant at the normal to the surface and the observations at 45 degrees with the normal to the surface may also be used. For materials which are directionally sensitive (e.g. prismatic sheeting), the colorimetric measurements are made using circumferential illumination and viewing and the various measurements are averaged. Calculations shall be done in accordance with ASTM E308 using the CIE 1931 (2 degree) Standard Observer.
RETRO REFLECTIVE SHEETING DAYTIME COLOR
CHROMATICITY COORDINATES OF CORNER POINTS
DETERMINING THE PERMITTED COLOR AREA
Yellow | X | 0.484 | 0.513 | 0.517 | 0.544 |
Y | 0.455 | 0.426 | 0.482 | 0.455 |
Luminance Factor (Y%) | Minimum | 10.0 |
Maximum | 36.0 |
Neb. Admin. Code EDUCATION, DEPARTMENT OF, tit. 92, ch. 92, app F