A Darwin man who burnished far-north Australia's reputation for outrageous behaviour during a road trip from Adelaide had his day in court on Tuesday.

Brenton Erhardt, 39, was fined after admitting filming himself masturbating while driving at 147 kilometres an hour along the Stuart Highway.

Police who stopped Erhardt for speeding found cannabis in the car boot and marijuana plants on the back seat. He was driving without a license, had drug paraphernalia with him and was carrying a loaded rifle.

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Taken from the South African Star.