LETTER VISIBILITY CHART
MAXIMUM READABLE
DISTANCE

100'
150'
200'
350'

400'
450'
525'
630'

750'
1000'
1250'
1500'

1750'
2000'
2250'
2500'
READABLE DISTANCE
FOR MAXIMUM IMPACT

30'
40'
60'
80'

90'
100'
120'
150'

180'
240'
300'
360'

420'
480'
540'
600'
LETTER
HEIGHT

3"
4"
6"
8"

9"
10"
12"
15"

18"
24"
30"
36"

42"
48"
54"
60"
This letter visibility chart is based on information provided by the California Institute of Technology. The distances will vary approximately 10% with various color combinations. 5,280 feet equals one (1) mile. Maximum distance in color would be RED or BLACK on WHITE background.