Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 171 - SCHOOL BUSES AND SCHOOL VEHICLES
Subchapter G - OPERATION STANDARDS FOR VEHICLES SUBJECT TOTHIS CHAPTER
Appendix B - NATIONAL SCHOOL BUS YELLOW
The color known as National School Bus Yellow was designated as such by the 1939 National Conference on School Bus Standards. The National Bureau of Standards of the United States Department of Commerce assisted in developing this color and its colorimetric specifications, as follows:
| C.I.E.Chromaticity Coordinates | Daylight Reflectance Y (%) | Dominant Wavelength (in millicrons) | Excitation Purity P (%) | |||||||
| x | y | max. | std. | min. | max. | std. | min. | max. | std. | min. |
| .5211 | .4549 | - | 41. | 40. | 584.5 | 583.5 | 582.5 | - | 93.7 | 89.0 |
At the 1980 Conference the colors in use were reviewed. A color standard was selected, slightly different from the above, and specific tolerances were chosen. These tolerances will insure a continuity of appearance from school bus to school bus, and within the same school bus when different elements are finished or refinished at different times. Specification for the Standard Color, with light and dark tolerances (Upper and Low Reflectances) are shown below in tabular form.
SPECIFICATION FOR STANDARD COLOR
| For Source C | ||||
| CIE Chromaticity Coordinates | Reflectance Y (%) | Reflectance tolerances | ||
| x | y | Upper | Lower | |
| .5089 | .4408 | 40.14% | 41.77% | 38.45% |
This appendix cited in 67 Pa. Code § 171.18 (relating to color); 67 Pa. Code § 171.47 (relating to color); 67 Pa. Code § 171.55 (relating to identification); 67 Pa. Code § 171.124 (relating to identification); and 67 Pa. Code § 171.134 (relating to identification).
