A speed camera rort has been uncovered in Sydney's west, where drivers are being fined not once, but twice.
An investigation's found some motorists are being snapped at two completely different speeds for the same offence on the Great Western Highway at Parramatta.
The RTA says it's an error with their processing system, not the camera itself.
Speeding Fine Campaigner Scott Cooper says that's a weak excuse, and fears other dozens of other drivers have also been caught up.
"Each lane of the road has censors implanted, and when the photo was taken it spells out quite clearly on top of the photograph, what lane it came from.
"If they're employing people who can't read the difference between lane one, lane two, lane three – what is to stop any motorist from being pinned innocently?"