Though someone could get in a lot of trouble for messing with
traffic warning signs, I'm still wondering if this is some
form of "Guerrilla Marketing" campaign for the up-coming movie.
This was a big thing like 5 years ago. The default password for road signs in the US is "DOTS" (department of transport safety). And it's trivial to reset it. <a href="http://gadgets.boingboing.net/2009/01/23/default-password-for.html" rel="nofollow">http://gadgets.boingboing.net/2009/01/23/default-password-fo...</a>