Hackers are hitting construction signs in Southern Colorado.The latest message? An electronic sign that warned "Caution: Zombie Stripper."Hackers have hit construction signs around the country including the Denver metro area.While the messages are often humorous, road crews are not laughing."It may be funny to them [hackers], but it is a real safety hazard to those that may be living in the area or traveling in the area," said Rick Bowman co-owner of Barricade & Sign.His message for the culprits, "You may think its cute, but it will be your responsibility when somebody gets killed."Bowman warns that drivers who see a sign changed should be extra careful driving in that area.