Letter Height	Maximum Impact	Maximum Readable distance
5/8”		15’
3/4”	the following distances	18’
7/8”	will vary approximately	21’
1”	10% with various color	24’
1 1/4”	combinations. Maximum	30’
1 1/2”	distance in color would	36’
1 3/4”	be RED or BLACK	42’
2”	on a white background.	48’
2 1/2”		60’
3”	30’	100’
4”	40’	150’
6”	60’	200’
8”	80’	350’
9”	90’	400’
10”	100’	450’
12”	120’	525’
15”	150’	630’
18”	180’	750’
24”	240’	1000’
30”	300’	1250’
36”	360’	1500’
42”	420’	1750’
48”	480’	2000’
54”	540’	2250’
60”	600’	2500’