Danger Working

Danger Working

"Danger working, keep away trom the wall"
This sign is across the alley from the front entrance of my youngest child's school. I'm not sure what the Chinese characters say on the sign.

My imagination went to work.

Is Danger a character?
Or is Danger something else?
Is there a story in this sign?

I want to include Danger in a story I write. The ideas are swirling.

P.S.
Signs like this (or notes from school) are not a rare occurrence. In every country I've lived there are mistranslations. Translating is hard and a native should always read to insure accuracy. I've read papers (in English) for very educated people who realized they need a native speaker check their grammar and word usage.