This the moment a militant cyclist learns an agonising lesson as she is run over trying to film the number plates of cars she claimed were harassing her.

Instead the 45-year-old biker, named only as Joyce in local media in Campo Grande, in the state of Mato Grosso do Sul, Brazil, filmed her own downfall as she was whacked off her bike.

Footage from a trucker's dashcam shows Joyce angrily turning around and giving him the finger twice as she rides down the middle of the road blocking anyone from passing.

Even though the lorry is keeping a long way back, she gesticulates furiously over her shoulder narrowly missing a tractor coming out of a side road in the clip from 8th May.

And earlier footage from the cyclist's own bikecam shows her trying to record the number plates of vehicles behind her as they try carefully to overtake her.

As the trucker honks at her to try to pass on the left she snarls (in Portuguese): "Film the plate of that son of a b****."

Moments later a Chevrolet Blazer SUV travelling parallel to the lorry inexplicably hits her rear wheel sending her crashing onto the tarmac.

With her bikecam filming up in the air, her soundtrack picks up her gasping yelps of pain and calls for help.

Further footage from the trucker shows her curled up on the road while the Chevy driver calls for police and paramedics.

The cyclist was rushed to the city's Santa Casa hospital where surgeons operated on a punctured lung and broken collarbone.

Her condition is reported as stable.

In an audio message sent from the hospital, Joyce claimed that two drivers had been harassing her for approximately two kilometres (1.2 miles) before the collision.

She alleged that one of the drivers deliberately swerved towards her, although that is not shown in her own footage.

The lorry driver said he had sounded his horn to warn her she was in danger by cycling in the middle of the road.

Police are investigating the crash.