BELLEVUE, Wash. -- A road construction sign that read "Zombies Drools" and "Jalopnik Rules" had motorists in a dangerous situation on Interstate 405 through Bellevue Tuesday night.

A Washington State Patrol Trooper noticed the reader board sitting on the side of I-405 at the Wilberton Tunnel with the unusual message and called Seattle dispatch.

WSDOT spokesperson Jamie Holter said she believes someone did this to be funny.

"They think it’s funny but it’s extremely dangerous," explained Holter. "First, they have to manually change the reader board so they are standing out on the side of the freeway putting their life in danger. Second, drivers think there are either Zombie’s ahead or it’s a joke, so they stay in the lane. The reader board should be warning drivers their lane is about to end as machinery is in the way. If drivers don’t know to change lanes then it becomes very dangerous."

This event doesn't seem to be isolated to a single occasion. The Web site mentioned in the alert, www.jalopnik.com, has a post about road signs that have been hacked all around the country. One post talks directly about the Bellevue sign with a member posting pictures.

"We told you guys not to hack electronic road signs to say 'Jalopnik Rules.' But you went ahead and did it anyway," read the post by Ray Wert.

What the KIRO 7 traffic department found scary was that on this Web site there are links teaching people how to hack road signs.

Holter finds this scary too. She urges motorists to call 911 if they see anyone in a construction zone that isn't in a hard hat and an orange vest.