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How should I choose the size for the signage?

SIZE

These are some Letter Height references for viewing distance.  You can use 1 inch of letter height for 10 feet for readability. 

This guide is based on research conducted by The Pennsylvania Transportation Institute, Penn State University, and The United States Sign Council (USSC). Aside from these guidelines, please make sure that you follow the limitations and guidelines for signage in the city where you plan to install the sign.

Letter Height (Inches)Readable Viewing Distance (Feet)
3″
4″
5″
6″
7″
8″
9″
10″
12″
14″
16″
18″
20″
22″
24″
26″
28″
30″
3′
4′
5′
6′
7′
8′
9′
10′
12′
14′
16′
18′
20′
22′
24′
26′
28′
30′