Redland City Mayor Melva Hobson unveiled the first two signs in Clifford Perske Drive, Thornlands, on Friday, with the others to be installed in pairs this week on Wellington and Sturgeon Streets, Ormiston.

"These signs form part of the council's koala policy and strategy, to raise consciousness in drivers of the risk they pose to koalas," Cr Hobson said.

"It is an alarming fact that 1875 koalas were killed on roads in the Redlands in the last 10 years, which is more than the current entire population of Redlands koalas."

At $8000 each, the signs can be moved to different locations around the city where koala hits are reported and are powered by a portable battery pack.

They collect and send data about the speed and frequency of cars back to the council via Bluetooth, which will then be passed on to the police to show speeding trends, although the signs do not contain any cameras.

On approaching the signs, drivers will see their current speed displayed, followed by a message either thanking them for saving koalas if they're below the speed limit, or warning them to slow down if they're over, and messages vary during different times of day.

Residents of Clifford Perske Drive welcomed the new signs, which come after a long campaign to reduce the speed in their street from 60km/h to 50km/h, started with a petition by resident Kay Grieve.

"We get young hoons here on Sunday afternoons and in the middle of the night, and a lot of people come racing down here because it's the only road that connects the main two roads in Thornlands," Mrs Grieve said.

"There have been a lot of accidents, not only with cars and humans but with wildlife here as well."

Dana Peterson lives on the corner of South Street and Clifford Perske Drive, and said they often had koalas in trees in their backyard.

"We have a council-approved wildlife fence, which has a gap of about 30cm at the bottom for wildlife to travel through, and we know they move through towards the road because they leave very obvious trails," she said.

This is the first usage of the signs in Australia, they are currently used in Austria to mark school zones. The council is currently investigating solar energy for the signs.