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The original Youtube movie of them putting the signs up was posted a week and a half to two weeks before a civilian, not one of Boston's Finest, discovered the deadly threat and acted on it, saving the city.

The Youtube account is jackpot321, but he pulled the Boston vids- when I saw them the first time, they said "posted ?? days ago" where ?? was 10, or 12, or 14 or something. Quite a while for a city-level threat to go undiscovered.

Look at the dates of the videos that are still up.

I have seen livejournal posts (I don't spend ALL of my time here) talking about seeing the signs well before they became a nuclear level emergency- the signs were popular among the folks who stay up and go out at night (college kids and people a few years out of school). Most of the signs were placed near clubs or bookstores, the ones near bridges were all at places where walkways went under the bridges (BU Bridge, Longfellow, MIT Bridge) so people going from Kenmore Square to MIT, for example, would come across them.

Since they were as bright as traffic lights, lots of people saw them.