Many people ask what size of lettering is best for viewing from the street. See below for a guideline for letter distance and minimum letter height.
VIEWING DISTANCE Minimum Required Letter Height
100 ft. 4 inches
250 ft. 10 inches
360 ft.(city block) 16 inches
500 ft. 22 inches
750 ft. 33 inches
1000 ft. 43 inches
1320 ft. (1/4 mile) 57 inches
This is based on naturally lit signs with all upper case Helvetica letters, utilizing optimal negative space. Factors that will affect required letter size are: color scheme, font selection, traffic and weather conditions.