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Nighttime Legibility of Ground-mounted Traffic Signs as a Function of Font, Color, and Retroreflective Sheeting Type

Nighttime Legibility of Ground-mounted Traffic Signs as a Function of Font, Color, and Retroreflective Sheeting Type

Susan T. Chrysler, Paul John Carlson, H. Gene Hawkins — 2002
A closed course nighttime legibility study measured legibility distance for 6-in. letters using Highway Series D and two experimental fonts, Clearview Condensed Road and a D-Modified font. The Clearview font has a thinner stroke width than Series D and was used for white-on-green signs. The D-Modified font has a thicker stroke width than Series D and was used for black letters on white, yellow, and orange backgrounds. Three types of retroreflective sheeting were tested: ASTM Types III, VIII, and IX.
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