The Herald of Rock Hill reports that one of the electronic signs, which normally flash messages about construction or crashes, read "Zombies Ahead" on Sunday. Another flashed "Watch for Hunters," while a sign on the other side of the road said "Be alert for Tanks."
The signs are on Highway 160 near Fort Mill, S.C.
Highway Patrol Lance Cpl. Billy Elder says someone apparently tampered with the signs sometime before 4 a.m. Sunday.
So far, there have been no reports of the undead or tanks.