Guidelines For Increasing Visability

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The following distances will vary approximately 10 percent with various color combinations.  Maximum visibility can be achieved with high contrasting colors, e.g. red or black graphics on a white background.

Maximum                                            Letter
Readable                                            Height
Distance                                             for Signs

100’                                                     3”

150’                                                     4’

200’                                                     6”

350’                                                     8”

400’                                                     9”

450’                                                     10”

525’                                                     12”

630’                                                     15”

750’                                                     18”

1000’                                                   24”

1250’                                                   30”

1500’                                                   36”

1750’                                                   42”

2000’                                                   48”

2250’                                                   54”

2500’                                                   60”

Note: Chart based on N.E.S.A. test, 1970.  Figures substantiated by test complied by the California Institute of Technology. Pasadena, California.