Treasury coffers could have pulled in $15 million during the trial had there not been a grace period.
Before the mobile phone detection cameras can be rolled out permanently across the state, the government will need to finalise a procurement process, which was expected to wrap up before the middle of the year.
More cameras will be rolled out in July and the government is due to begin issuing fines in October.
A Transport and Main Roads spokesman said the cameras also caught more than 2200 people not wearing a seatbelt, including drivers and front seat passengers.
“The cameras will be rolled out in the second half of 2021, with the first three months of operation sending warning notices to potential offenders, before infringement notices are issued,” he said.
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“When the cameras are rolled out they will be in operation anywhere, anytime.”
The camera installed on the Western Freeway may be moved when the campaign is rolled out across the state.
The TMR spokesman said the department would not release where the cameras would be located and, unlike speed cameras, those used to detect mobile phone use were not signposted during the trial.
In the December budget, the state predicted fine revenue to grow by almost a third next financial year, “partly driven by the introduction of new cameras that detect use of mobile phones and if seat belts are being worn”.