Officials said the signs are password protected, but that generally does little to stop hackers intent on changing them.
Last year, a string of road sign hacks were made in three separate states.
In Austin, Texas, a sign cautioned drivers to the "ZOMBIES IN AREA! RUN." Another in Collinsville, Illinois said "Daily LANE CLOSURES DUE TO ZOMBIES." And another in rural Indiana read "RAPTORS AHEAD - CAUTION."
Reaction to the sign, posted on the "Today in South Florida" Facebook page was mixed.
"Wow someone has a lot of time on their hands to think up of how they can belittle and disrespect a group of people who help keep this country going," said Luly Cueto-Belot.
"Greatest thing I ever saw...let's take this country back dammit!!!..south will rise again mother---er!!" said David Pines.