Austin Road Signs Hacked
kxan.com
kxan.com
FTFA: "And so they had to break in and hack into the computer to do it, so they were pretty determined," said Hartley.
It's been widely posted on various tech blogs lately that the default password for these signs (which is rarely ever changed) is "DOT". Plus you can apparently factory-default the sign by hold 3 buttons of the programming fob.
Before the world of electronica, this was simply called "mischief".
Then repeated here: http://news.ycombinator.com/item?id=454348
Third time lucky?