Luminance and contrast for sign legibility : additional results and applications. Paper prepared for the 55th Annual Meeting of the Transportation Research Board TRB, Washington, D.C., January 1976.

The report gives additional results on color recognition and applied luminance and contrast effects to legibility distance for eleven color combinations, after correction for letter width and stroke width. A method of estimating legibility was developed for black and for white letter and sign combinations. The Method involves luminance ratios and maximum legibility distance values based on a stroke width one-sixth of letter height. (See also B 6018).