Port Fairy police intercepted the South Australian man on the Princes Highway at Codrington during the Easter long weekend Operation Nexus.

The motorist was clocked at an alleged 149km/h - nearly 50km/h over the speed limit.

He had an adult front passenger and three young children in the back seats.

Acting Senior Sergeant Cameron Ross, who has been overlooking the long weekend road operation in the south-west, said the alleged driving was "very inappropriate".

"Those sorts of speeds you cannot justify, especially with children in the car," he said.

"It's too fast. It's also an inexperienced driver, a P-plater, who has put their own life at risk, as well as the children and other road users.

"It's very inappropriate, it's excessive and it plays a significant roll in our road trauma."

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Acting Senior Sergeant Ross said no matter how many high speed offences police detect "you never get used to it".

"Considering the amount of media that we do about speed being a major factors contributing to serious road accidents and collisions, it still staggers me that people do those speeds on our roads," he said.

The driver was disqualified from driving for 12 months and was hit with a $826 fine.

Operation Nexus started at midnight Thursday and ran through until midnight Monday, with all available police officers focusing on reducing road trauma, including local road policing units, general duties officers and other regional resources.

The statewide police operation targeted the fatal five - speeding, impaired driving, fatigue, mobile phones and seat belt compliance.

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