Fake cop gives out traffic fine

A man has fitted flashing red, white and blue lights to his car and posed as a policeman, hitting up a Brisbane motorist for money to pay a fake traffic fine.

Police said a woman was pulled over on Beenleigh-Redland Bay Road, Cornubia, about 4pm (AEST) on Sunday by a man wearing blue pants, a blue business shirt and cap and driving a white Suzuki Swift hatchback with dashboard lights.

The man told the woman she had committed a traffic offence and asked for an upfront cash payment for the fine.

When the woman challenged him and asked for identification, he left in his car.

Police say that officers will never ask for money and motorists should ask to see an officer's metal police service badge and photographic identification card if they suspect something is amiss.

"Any motorist that believes the unmarked vehicle attempting to intercept them is not a police vehicle is urged to contact local police or, if they fear for their safety, to call triple zero to verify the identity of the vehicle or the person," a statement said.