LED Sign / Display Message Center Readability Chart

 Character Height 

 7' 

 8' 

 9' 

 10' 

 12' 

 14' 

 24' 

 Readable Distance 

 350' 

 400' 

 450' 

 500' 

 600' 

 700' 

 1200' 

Drive By Speed

Average Readable Time in Seconds

 25 MPH 

 10 

 11 

 12 

 14 

 16 

 19 

 33 

 35 MPH 

 7 

 8 

 9 

 10 

 12 

 14 

 23 

 45 MPH 

 5 

 6 

 7 

 8 

 9 

 11 

 18 

 55 MPH 

 4 

 5 

 6 

 6 

 7 

 9 

 15 

 65 MPH 

 4 

 4 

 5 

 5 

 6 

 7 

 13 

 75 MPH 

 3 

 4 

 4 

 5 

 5 

 6 

 11 
Generally a minimum of 7 seconds of readable time is recommended for most applications
A readable time displayed in GREEN in the table above would be considered ideal
A readable time displayed in YELLOW in the table above would be considered a minimum
A readable time displayed in RED in the table above would not be recommended