It's been there since 2007 but the noise camera on Mt Ousley Road appears to have no purpose, according to state opposition roads spokesman Ryan Park.
Mr Park, who is also the member for Keira, said not a single fine had been issued since the camera was installed.
In a reply to a question in Parliament from Mr Park on the camera's use, Transport Minister Gladys Berejiklian said "there is no legislative basis to issue fines for noise from engine compression brake use in any jurisdiction in Australia".
During a trial by the previous Labor government from late 2007 until early 2009, more than 400 letters were sent to truck owners exceeding the brake noise standard with advice on how to fix that problem. But none of the owners was fined and no warnings have been issued since.
Which raises the obvious question - if no-one has been cautioned since 2009 and the government is unable to fine those who brake too noisily - why is the camera there at all?
"Residents have said to me, 'if it's not doing its job, what's the purpose of it?" Mr Park said.
"If it's not doing what it's supposed to do, either take it down or get it fixed."
Mr Park conceded that the previous Labor government, which installed the camera, was in charge of it until last year and it was something that "should have been sorted out".
"This is not a political attack on the current government in any way," he said.
"I'm saying now, as a local member and shadow minister for roads, I'm happy to work with the government to make sure this issue gets addressed.
"These people who live along Keiraville, Mt Ousley, Mt Pleasant, Balgownie all have to experience this noise.
"We've got devices in place that should be keeping an eye on this and it's obviously not doing its job."
For Mr Park, that includes fining those truck drivers who exceed noise limits.
"[The government] is saying they don't have the legislative framework for them to do anything about it," Mr Park said.
"I'm saying that's not good enough.
"We need to sit down and work out a way in which we can make this happen.
"If new laws need to be introduced, then let's do that."
A spokesman for Roads Minister Duncan Gay said the Mt Ousley site was used by Roads and Maritime Services (RMS) to trial various "noise enforcement technologies".
"They have been successful in monitoring engine brake noise in combination with an approved digital camera device to enforce the standard.
"Based on the trials, RMS has identified some changes which are required to the national engine brake noise standard.
"RMS is working with the National Transport Commission to make the necessary changes to the standard," he said.