A Knox County street has its old speed limit back after public works officials took down an unauthorized sign that lowered the speed limit by 15 miles per hour.

The Knox County Sheriff’s Office recently noticed a 25 mile-per-hour sign on Tipton Station Road near South Doyle High School.

The problem is, the speed limit on that road is supposed to be 40 miles per hour.

Officials say it looks like someone took the “SPEED LIMIT 25” sign from a neighborhood and attached it to a utility pole in the new location.

Jim Snowden said he’s only seen one other case like this in his 18 years with the Knox County Public Works Department.

"I actually had a location where the gentleman had put up his own four-way stop,” Snowden told WBIR 10News. “We had declined the request because it wasn't warranted and he had installed his own. So we once again had to go remove that, because us as the engineering department for the county are the only ones who are required by law to be able to install official traffic signs for the safety of the public.”

The unauthorized sign on Tipton Station Road has been taken down. No one has been cited for the crime.

Under state law, moving a public sign is a class C misdemeanor, which can be punishable by up to 30 days in jail, a fine up to $50 or both.