New cameras to detect drivers using mobile phones rolled out across Vic

Drivers using mobile phone are now in the sights of the NSW government.

It will spend $88 million rolling out fixed and portable cameras across the state to detect motorists using phones.

The cameras will operate 24 hours a day and - unlike speed cameras - there will be no warning signs to alert drivers as they approach.

The high-definition cameras use artificial intelligence to spot drivers using their phones, regardless of the weather or time of day.

It follows a six-month trial of three cameras which recorded more than 100,000 drivers in 85 million car movements using their phones illegally.

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For the first three months of the crackdown, errant drivers will simply receive a warning letter but after that, it will be a $344 fine and five demerit points.

The cameras are expected to be rolled out by December.