A fleet of speed cameras are back in action close to 20 months after a software glitch saw them taken off WA roads.
The dual-facing cameras were first rolled out in late 2017 but in May 2018 they were pulled from operation because of the glitch police said led to a 26-year-old woman being wrongly accused of speeding at 162km/h.
A statement said the cameras had since been "stringently" tested, including measuring the speeds of more than 9.6 million vehicles in a range of conditions.
They were also extensively testing by independent, accredited testing authorities in Australia.
The cameras are provided under a contract with global technology company, Jenoptik. The police statement said Jenoptik was confident the software fault had been fixed..
"From the time the Jenoptik cameras were put in use until the time the problems were detected, the speeds of more than 3 million vehicles were measured and 55,000 infringements were issued," the statement read.
The cost of the dual-facing speed cameras has not been released.