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Viewing
Distance
(feet)
Minimum
Text Height
(inch)
Viewing Time
@ 30mph
(seconds)
200 4 4.5
250 5 6.0
300 6 7.5
400 8 9.5
500 10 12.0
600 12 15.0
900 18 22.5
1200 24 30.0
1800 36 46.0
NOTE: All data is approximate.

If you were in a vehicle going 30 mph,
you would need a minimum of a 4-inch
character height at a 200 feet viewing
distance for your outdoor sign.

 

Your viewing time can be affected by obstructions,
traffic speed, character size and character style.

 

The chart on the right will give you an idea of your
viewing time or try the formula below.

 

 

 

 

 

 

Viewing Time Formula


  1. Feet in a Mile X Travel Speed = Feet Traveled in an Hour
    5280 feet/mile X 30 mph = 158,400 feet

  2. Feet Traveled in an Hour ÷ Number of Minutes in One Hour = Feet Traveled per Minute
    158,400 feet ÷ 60 minutes/hour = 2640 minutes

  3. Minutes Traveled ÷ Number of Seconds in One Minute = Feet Traveled per Second
    2640 minutes
    ÷ 60 seconds/minutes = 44 feet

  4. Viewing Distance in Feet ÷ Feet per Second = Number of Seconds to View Display
    200 feet
    ÷ 44 feet = 4.5 seconds


 

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