GREENE COUNTY, Va. (CBS19 NEWS) -- The Greene County Sheriff’s Office is telling drivers to slow down by adding speed cameras.

New signs at the beginning of school zones now tell drivers their speed is about to be enforced by camera.

“Speed is an issue in Greene,” said Capt. Jason Tooley, head of the patrol team.

Last year, the Sheriff's Office handed out almost 4,000 speeding tickets.

Tooley said they're getting more calls than they can keep up with, especially in school zones.

"They did a 20-day trial day trial run to see what would happen, what kind of problem we have, and that turned into approximately 254 violations a day through the activated school zones," he said.

The cameras will activate one minute after the light flashes and report any car driving 11 miles per hour over the speed limit.

A 30-day trial period starts Thursday. After that, any speeder will have to pay a $100 fine.

"We want to get people’s attention. To pay attention that when they're behind the wheel of an automobile that ways several thousand pounds ... the destruction it can do if they hit someone or a child or a school bus," Tooley said.