Newly released documents show the ACT Government was warned about problems with a point-to-point speed camera in Canberra's south, but it was installed anyway.

A departmental brief released under Freedom of Information show the Government failed to identify a potential conflict between the point-to-point speed camera on Athllon Drive, and its own plans for a Wanniassa 'park and ride' on the same stretch of road.

The problem was not uncovered until significant funds had been spent on the camera.

The Government was urged not to install it on Athllon Drive or find a new preferred site for the 'park and ride'.

But Opposition spokesman Alistair Coe says Planning Minister Simon Corbell told an ACT Legislative Assembly committee in June he had never considered relocation.

"Simon Corbell signed that brief and marked it as noted," he said.

"Yet in estimates just a couple of months ago, he denied ever considering removing point to point speed cameras in Athllon Drive."

Mr Corbell denies misleading the Assembly.

"It was never in question the issue of relocating the camera," he said.

"It was never an option that the Government took seriously for one moment and that was because the project was already funded in the budget and to abort the project would be to waste taxpayers money."

The camera was switched on earlier this year, amid public criticism the chosen stretch of road includes two roundabouts.

Mr Coe says says it is a bungle.

"The Government spent hundreds of thousands of dollars putting these cameras in and it seems they may well turn out to be a white elephant," he said.

A spokeswoman says the Government still wants a Park and Ride at Wanniassa and planning work is being done to ensure it fits with the camera's operations.