This letter visibility chart is based upon information provided by Pennsylvania Transportation Institute, Penn State University and the United States Sign Council (USSC).
360 ft. (city block)
1320 ft. (1/4 mile)
Minimum Letter Height
Calculations based on an externally (or naturally) lit sign with all upper case Helvetica letters utilizing optimal negative space. Factors that may affect required letter size are: color scheme, font selection, traffic and weather conditions, or sign standoff. Please refer to the complete study for additional information.