In addition to its appearance on road signage, a customized version of the ClearviewText typeface was adopted by AT&T for corporate use, including advertising, beginning in 2006. The FHWA also refused to add Clearview to the 2009 MUTCD, citing lack of testing on Clearview's numerals, symbols, and narrower typefaces. The FHWA has not granted approval for Clearview to be used on negative contrast road signs (dark legend on light background, such as black on white or yellow), given its inferior legibility to the existing FHWA typefaces in these applications, although it is used in this fashion in Pennsylvania. Official acceptanceĬlearview was granted interim approval by the FHWA for use on positive contrast road signs (light legend on dark background, such as white on green, blue, or brown) on September 2, 2004. Two key differences are much larger counter spaces, the enclosed spaces in letters like the lower case "e" or "a," and a higher x-height, the relative height of the lower case "x" to the upper case "X." Smaller counter spaces in the FHWA fonts reduced legibility, particularly when the letters glowed from headlight illumination at night. Instead, using a similar weight to the FHWA fonts, a new font was created from scratch. The designers of Clearview sought to create a typeface adapted for mixed-case signage, initially expecting it would be based on an existing European sans-serif typeface. The standard FHWA typefaces, developed in the 1940s, were designed to work with a system of highway signs in which almost all words are capitalized.
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