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Visual characters shall comply with 703.5.

EXCEPTION: Where visual characters comply with 703.2 and are accompanied by braille complying with 703.3, they shall not be required to comply with 703.5.2 through 703.5.9.
703.5.1 Finish and Contrast
Characters and their background shall have a non-glare finish. Characters shall contrast with their background with either light characters on a dark background or dark characters on a light background.
Advisory 703.5.1 Finish and Contrast.  Signs are more legible for persons with low vision when characters contrast as much as possible with their background.  Additional factors affecting the ease with which the text can be distinguished from its background include shadows cast by lighting sources, surface glare, and the uniformity of the text and its background colors and textures.
703.5.2 Case
Characters shall be uppercase or lowercase or a combination of both.
703.5.3 Style
Characters shall be conventional in form.  Characters shall not be italic, oblique, script, highly decorative, or of other unusual forms.
703.5.4 Character Proportions
Characters shall be selected from fonts where the width of the uppercase letter "O" is 55 percent minimum and 110 percent maximum of the height of the uppercase letter "I".
703.5.5 Character Height
Minimum character height shall comply with Table 703.5.5. Viewing distance shall be measured as the horizontal distance between the character and an obstruction preventing further approach towards the sign.  Character height shall be based on the uppercase letter "I".
Table 703.5.5 Visual Character Height
Height to Finish Floor or Ground
from Baseline of Character
Horizontal Viewing Distance Minimum Character Height
40 inches (1015 mm)
to less than or equal to 70 inches (1780 mm)
less than 72 inches (1830 mm) 5/8 inch (16 mm)
72 inches (1830 mm) and greater 5/8 inch (16 mm), plus 1/8 inch (3.2 mm) per foot (305 mm)
of viewing distance above 72 inches (1830 mm)
Greater than 70 inches (1780 mm)
to less than or equal to 120 inches (3050 mm)
less than 180 inches (4570 mm) 2 inches (51 mm)
180 inches (4570 mm) and greater 2 inches (51 mm), plus 1/8 inch (3.2 mm) per foot (305 mm)
of viewing distance above 180 inches (4570 mm)
greater than 120 inches (3050 mm) less than 21 feet (6400 mm) 3 inches (75 mm)
21 feet (6400 mm) and greater 3 inches (75 mm), plus 1/8 inch (3.2 mm) per foot (305 mm)
of viewing distance above 21 feet (6400 mm)
703.5.6 Height From Finish Floor or Ground
Visual characters shall be 40 inches (1015 mm) minimum above the finish floor or ground.

EXCEPTION: Visual characters indicating elevator car controls shall not be required to comply with 703.5.6.
703.5.7 Stroke Thickness
Stroke thickness of the uppercase letter "I" shall be 10 percent minimum and 30 percent maximum of the height of the character.
703.5.8 Character Spacing
Character spacing shall be measured between the two closest points of adjacent characters, excluding word spaces.  Spacing between individual characters shall be 10 percent minimum and 35 percent maximum of character height.
703.5.9 Line Spacing
Spacing between the baselines of separate lines of characters within a message shall be 135 percent minimum and 170 percent maximum of the character height.

Related Code Sections

703.5 Communication Elements and Features, Visual Characters
Visual characters shall comply with 703.5. EXCEPTION: Where visual characters comply with 703.2 and are accompanied by braille complying ...
703.5.3 Communication Elements and Features, Style
Characters shall be conventional in form.  Characters shall not be italic, oblique, script, highly decorative, or of other unusual forms ...
703.5.9 Communication Elements and Features, Line Spacing
Spacing between the baselines of separate lines of characters within a message shall be 135 percent minimum and 170 percent maximum of the character ...
703.5.7 Communication Elements and Features, Stroke Thickness
Stroke thickness of the uppercase letter "I" shall be 10 percent minimum and 30 percent maximum of the height of the character ...