This guide provides test procedures and methods of obtaining and reporting data that will promote the uniform evaluation of the photometric nighttime performance of roadway sign installations.
The guide generally applies to all roadway sign installations using an integral lighting system. These signs may be externally illuminated, utilizing nontransparent (opaque) surface materials (legend, border, and background); or, they may be internally lighted, utilizing translucent sign materials. This guide does not address the measurement and evaluation of luminous source message signs (matrices of individual lamps or other luminous elements making up a message). In the context of this guide, retro-reflective sign materials are considered only insofar as they yield luminance values due to their fixed lighting systems. Additional information is available for photometrically evaluating roadway signs made of reflective materials that are illuminated by automotive headlights.
Softcover or Secure PDF: 9 pages
Publisher: Illuminating Engineering Society (2003)
SKU: IES LM-52-03
Dimensions: 8½” x 11″