From moosebumps' Flickr page: "I whipped this up Friday afternoon after a costume party invite. It normally says "LANE ENDS MERGE RIGHT" and can be hacked to say "CAUTION! ZOMBIES! AHEAD!!!"
When you open the access panel, the blinking green light indicates normal operation. To hack the sign you must figure out which of six bolts is the key and clamp an alligator clip to it. The light will flash blue quickly and then continue flashing red while the hacked message is displayed. The key bolt is randomly picked each time the hack is disengaged."
Amazing job, moosebumps!
Oh, as long as we're talking about hacked road signs, a few weeks ago I made a YouTube video featuring a bunch of hacked road signs, some news footage and a link to signhacker.com. Our own Spessa is responsible for the new "you stupid idiot" sign hack which appears about 25 seconds into the video: