Letters on signs are a record that you did make it this far and crossed the state line or
appealing posters plastered around advertising an event (I think) or
be reminiscent of, in this case, the song Edelweiss from Sound of Music which I watched again just recently and found the song just as emotive as it always had been or
amusing and obviously not paid any heed to or
a statement of the obvious. Do you really need to be told that it extends seawards? Or
simply a warning.