LOOMIS, Calif. (AP) -- A prankster is changing the message on an electronic traffic warning sign in Northern California.

The sign is supposed to tell people that a road in the Placer County city of Loomis will be closed for pipeline construction.

Instead, it read, "Smoke Weed Everyday" last week. The Sacramento Bee reports that it has also read, "Caution Loose Gorilla!"

Placer County Water Agency Senior Engineer Tony Firenzi told the Bee it took skill to change the message. The unknown hacker needed a keyboard and had to bypass some systems.