Sure, maybe in an email. But with road signs, the priority is to comprehend what you’re seeing from as far away as possible—and a mix of uppercase and lowercase letters is better at accomplishing that ...

For years, social media users have claimed that the terms "uppercase" and "lowercase" got their names due to capital letters ...

But with road signs, the priority is to comprehend what you’re seeing from as far away as possible—and a mix of uppercase and lowercase letters is better at accomplishing that than all caps.