Electronic road signs across the country, usually used to advise of traffic or weather conditions, have begun to warn motorists of some other strange problems lately – zombies.

It seems that pranksters have been hacking into the signs and changing their screens to read of warnings of the undead and raptors or other problems. Some signs have even told drivers that no one loves them.

Police in some parts of the country are worried that the signs could be problematic to passing motorists who may be laughing too hard to concentrate on the road.

“We understood it was a hoax, but at the same time those boards are there for a reason,” Joe Gasaway, an Illinois Department of Transportation supervisory field engineer told the Associated Press. “We don’t want [drivers] being distracted by a funny sign.”

Recently the auto blog Jalopnik posted a how-to guide to hacking into one of the electronic signs. However, the site did run the following warning:

“DO NOT under any circumstances run around hacking into electronic road signs using the information contained in this step-by-step guide of how to transmit hilarious messages to passing motorists.”

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Since running the guide the site has posted pictures of 20 different messages that have been hacked onto electronic signs.