However, the Department of Justice has assured drivers the camera did not necessarily book a car every time it flashed.

Dandenong resident Joseph Wright said he was riding his bike with his nine-year-old son about two weeks ago when he saw a camera malfunction at the intersection of Lonsdsale and Webster streets.

He said it flashed at every car that drove through the intersection, before "flashing constantly at nothing", for almost one minute.

It wasn't the only time Mr Wright had noticed the fixed speed camera. On other occasions he had seen police taking photos of the camera and people seemingly repairing it.

It is believed the same camera was also flashing constantly last Sunday week.

The state government will activate four new speed cameras in Greater Dandenong in the next two months after the release of an auditor-general report which validates Victoria's road safety program.

Mr Wright said what he had seen made him doubt the accuracy of fixed cameras "They tell you these things are infallible, but if it's happened to this one, it opens up debate now for the rest of them."

A Department of Justice spokesman said the flashing camera was "not out of the ordinary".

"Fixed intersection cameras will regularly flash as part of routine testing and maintenance, even when there are no cars near the intersection."

The spokesman said infringements from that intersection, and all intersections, were verified before any driver was booked.

"Any infringements that do not meet these strict verification requirements are thrown out long before they see the light of day.

''However, the department has asked its camera provider to provide further information about the operation of the camera's flash component."