"Martin Watts filted:"
"I'm fine with that, too."
"It bothers me to realize that my profession would see nothingwrong with the original; the "NOT" Boolean operator binds tighter than either "AND" or "OR"..r"
"The commas do the trick for me, except for the last one whichsomewhat muddles things. I wouldn't need semicolons to ... informthe authorities. My version, then, would be: 'Don't touch, check with other passengers, then inform station staff or call 999.'"
One way to interpret the original from Philip actually, it was the first way I interpreted it is "Don't touch, don't check with other passengers, don't inform station staff or call 999." With a comma after the first in the series ("don't touch"), the "don't" carries forward to all commands that follow. (As RH has already indicated.)
Adding "then" did make it a bit less likely to be read incorrectly, but it did not fully eliminate the ambiguity. IMO.
Putting a period (or a semicolon) after "touch" would stop the continuing "don'ts." (As Martin as already indicated.)
I asked someone else to read the sentence in question, and that person did not extend the "don'ts" but saw the sentence the way you did. That comes, I think, with grasping the point immediately and not needing to read too carefully. The big problem with that is that not everyone's mind works that way, and not everyone's native language is English.
Maria Conlon
When it's you against the world, back the world. (Zappa)