Design using white reflectorized letter on dark background was selected for signs installed on Pentagon road network just outside of Washington, DC; spacing values selected so that white areas between would appear equal; effect on nighttime legibility of increasing spacing between white reflectorized letters on black background.
Effect of letter width and spacing on night legibility of highway signs
Traffic Eng
Traffic Engineering ; 27 , n 3
1956
8 pages
Article (Journal)
English
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