South Australian police have decided not to appeal a Supreme Court decision which forced changes to the testing of red light cameras across Adelaide and the scrapping of dozens of fines.
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Earlier this month the court found a motorist's fine invalid because police only tested the devices by driving through a green light.
The decision forced police to recheck all 134 cameras across the city by driving a police vehicle through a red light under controlled conditions.
On Saturday the force said testing had been completed and all fines issued since October 8 would be considered valid.
But it said any unpaid fines issued before that date would be withdrawn.
Police also confirmed they would not seek to appeal the original Supreme Court judgment based on legal advice.
Premier Steven Marshall said the government supported the police decision.
"We've got to make sure that we are doing the right thing and making sure that all of those cameras are properly calibrated," he said.
"That's precisely what's happened."
The new testing regimes requires police to shut down individual intersections for a short period to check the cameras are operating correctly.
They've warned the new requirements are likely to cause disruptions for motorists from time to time.
Australian Associated Press