A study conducted jointly by the Texas and Pennsylvania Departments of Transportation in April 2006 concluded the Clearview font increased the visibility distance for drives by 12% versus the existing Series E Modified font.
In 1994, the Federal Highway Administration determined highway signs were no longer visible enough for a population that included older drivers. Over the next decade, the Clearview font was developed. Subsequently, the Texas and Pennsylvania DOTs conducted separate studies to determine the Clearview font’s effectiveness.
The full report on this font can be found at http://onlinepubs.trb.org/onlinepubs/trnews/trnews243RPO.pdf
