In two PTI studies intended for conventional road guide signs, use of an early version of Clearview, called "Clearview-Bold," is reported to have improved nighttime sign reading distance by up to 16 percent when compared with Standard Alphabet Series E(modified). The initial research on Clearview was conducted at PTI. The legibility of positive-contrast Clearview legends for guide signs was researched by the Pennsylvania Transportation Institute (PTI) and the Texas Transportation Institute (TTI).
This research development effort resulted in final design of Clearview font letters in 2003. Specifically, the first studies on Clearview stated that the intent was to replace the Standard Alphabets rather than also explore improvements thereto. The stated goal of the Clearview font was to increase legibility and reduce halation of highway sign legends in comparison to that of the FHWA Standard Alphabets (to which the developers refer as "Highway Gothic font," even though "Gothic" historically has referred to letter forms of very intricate design, such as those used on newspaper mastheads, by contrast with the simple, non-stylized letter forms of the Standard Alphabets). The Clearview font was developed through research starting in the late-1990s.
Since the issuance of the interim approval, various organizations have continued to research highway sign fonts. The early research led to FHWA's issuance of the Interim Approval for the use of Clearview Font for positive contrast legends on guide signs. Research related to alternative fonts for signs has been ongoing since the 1990s. Table of Contents Report on Highway Guide Sign Fonts 3.0 Research on Clearview
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