Speeding drivers are putting their neighbours at risk, routinely breaking the limit on a quiet Mundoolun street.
It has prompted a local to step in and slow them down on Naitonal Road Safety week.
Raj Aggarwal, the suburb's Neighbourhood Watch president, has lined John Collins Drive with the signs reminding drivers of the speed limit after some troubling results from a week-long study by Logan City Council.
The data revealed that more than 85 per cent of drivers did more than 20km/h over the 50km/h limit.
Five drivers were clocked at more than double the limit.
Mr Aggarwal installed 30 of the signs along the stretch in a move which coincided with National Road Safety Week.
He said it was a necessary step before a child was hurt or killed. The speeding drivers also put wildlife of the quiet suburb at risk.
Mr Aggarwal said inattentive drivers were the real risk to residents - especially children - and animals.
"I think the majority of people are not speedsters," he said.
"It's people winding down after work who are more dangerous."
Mr Aggarwal would be happy with getting through to 70 per cent of people with the signs campaign.
"I'm going for 70 per cent compliance, but if I can get more, I will take it," he said.
"There's always going to be one idiot, you can't stop that."
"Heaps of people have already commented on the community page.
He said the speed device from council which hit home to him how bad the problems were.
"I knew there were people speeding, but I did not know it was that bad," Mr Aggarwal said.
"This is a good old suburban street. Kids are out riding bikes, kids are running around outside.
"It's the reason people bought in this estate."
Division 9 councillor Scott Bannan slammed the drivers for their behaviour in putting their neighbours at risk.
He said council would take action if drivers did not, in conjunction with police.
"People need to take responsibility for their own actions behind the wheel," Cr Bannan said.
"They live in the estate, They are speeding in their own backyard. It takes one minute to slow down.
"Don't blame council or the police if we need to take action.
"If people don't want traffic calming devices, slow down."
It comes as Logan district has recorded the largest increase in road fatalities of any police district in the state so far in 2020.
Nineteen drivers have died on Logan roads this year - 16 more than this time last year.
Read more local news here