It began at 4pm on Christmas Eve and doesn't end for another week - 6am on Tuesday.
Tamaki Makaurau Road Policing Manager Inspector Scott Webb says the messaging can sound like a broken record.
But he told Tim Dower it really does come down to the basics.
"People not wearing their restraints. There's alcohol, there's distractions, and there's speed. Those are main causal factors."
Crashes yesterday saw two people die in separate crashes - one at Dairy Flat, north of Auckland and the other on Nikau Road, near Palmerston North.
Two people died in a crash Monday between a truck and a motorcycle on the Oreti River Bridge, in Southland.
A man died at the scene, and a woman later died in Dunedin Hospital.
It follows four deaths in Auckland in two separate crashes, one on Christmas Day, the other on Boxing Day.
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