Transport Agency road safety director Ernst Zollner agreed.
There were more than 1500 deaths and 6700 serious injury alcohol-related crashes in the past decade, Mr Zollner said.
Lowering of the blood alcohol limit brought New Zealand into line with the limits already in place in the majority of OECD countries, he said.
"Together with other recent changes including zero alcohol limits for teens and new penalties for serious and repeat drink-driving offenders this measure will make New Zealand roads safer for everyone."
Western Bay road policing Sergeant Mike Owen said while the numbers of people prosecuted in this region for drink-driving was tracking down, the number of drivers caught two or three times over the limit was "astounding".
"There is no excuse for it when there are other (transport) options, such as using a sober driver, dial-a-driver, and taxis," he said.
"Police are being as visible as we can be, but at the end of the day people need to take responsibility for their own behaviour and not drink and drive."
Caroline Perry, director of road safety charity Brake New Zealand, said the lower limits were a step in the right direction to stamp out deadly drink-driving.
"Thousands of people have needlessly lost their lives or been seriously injured in drink-drive crashes over the last decade, so it's fantastic to see that the lower limit will be implemented.
"We know that there is a huge amount of support for this from the public, who rightly see drink-drivers as a menace on the roads, who are putting other innocent road users at risk."