"Don't drink and drive. Get a sober driver, or a friend to take you home, or a taxi. We will enforce this with zero tolerance. I do not want families to have to go through the loss of a loved one at this time, or any time."
Northland's road toll for the year stands at 13, with the alcohol a major factor in fatal crashes. October to December is generally the worst time on the region's roads for fatalities.
With the busy Christmas party season coming up, police will be be breath-testing any driver they stop, at all hours of the day, he said.
The warning comes prior to the lowering of breath and blood alcohol limits on December 1. The limit will lower from 400 micrograms of alcohol per litre of breath, to 250mcg for drivers over 20.
The blood alcohol limit will reduce from 80 milligrams of alcohol per 100ml of blood, to 50mg. There is a zero limit for drivers aged under 20.