Road Signs Hacked Twice

Daryl Dixon will be in Louisville Ky for the Mid America Comic Con next week. Could this be a warning?
LOUISVILLE, KY (WAVE) – Hours after a prankster told drivers to "HONK IF YOURE [sic] HORNY," an electronic highway sign along Brownsboro Road was changed again to read, "BEWARE OF ZOMBIES."
The sign is supposed to warn drivers about a shift in traffic patterns approaching construction work on Brownsboro Road near Hite Avenue, according to Lindsay English, a spokesperson for Metro Public Works and Assets.

Lindsay said all such signs are password-protected and can be programmed one of two ways: through a control box on-site or through a laptop computer that's connected to the sign.
The city did not know who changed the sign or how the person or persons were able to do it. It was not clear whether the same person was responsible for both incidents.
The zombie sign was posted early Wednesday morning. The previous message was posted sometime Tuesday evening.
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Road sign warns of the walking dead - wave3.com-Louisville News, Weather & Sports