Letter size for the distance
The app suggests capital letters of at least 4 cm for every 10 m people read the sign from.
It follows the United States Sign Council guideline: on a town street a sign reads from about 25 feet per inch of capital-letter height, and text in capitals needs 15 % more. Bold letters with strong contrast read further; this is a guideline, not a Colombian rule.
Source: United States Sign Council Foundation, Guideline Standards for On-Premise Signs (2018) – read it
