You could just read the article, it’s in there.

Why would I do that?

Are you new to the TSA?

Not new, my first encounter with them was many years ago now, when they were new, but I only ever have any interaction with them when visiting the US.

The TSA says the list of acceptable IDs is subject to change without notice.

WTF!?

This video, Why US Signs Look Different Than The Rest Of The World’s, contains a lot of examples of such US road signs that depend on English text to convey their message:

https://www.youtube.com/watch?v=Wzr0GYfRsKI

In the US, traffic signs with crucial information are often written in only English text, no symbols, pictograms or anything else that could make it possible to guess what the sign is saying without being able to read English.

No hassle? I think you severely underestimate the effort required to learn Danish.