NZTA road safety director Ernst Zollner said interlocks and zero-alcohol licences were part of a concerted effort to reduce deaths and injuries caused by drink-drivers.
The same legislation gave courts the power to impose zero alcohol sanctions on serious and repeat offenders, requiring drivers to maintain a zero alcohol limit for a fixed period of three years.
Since September 10, 2012, more than 3800 zero-alcohol sanctions have been handed down and 171 zero-alcohol licences have been issued.
The number of serious crashes with drunk drivers has dropped and 2013 is on course to be the lowest road toll in more than 50 years, says Associate Transport Minister Michael Woodhouse.
How the devices work
* Alcohol interlocks are a device similar to a breath analyser and are connected to a vehicle's starting system. Before the vehicle can be started, the driver must provide a breath sample.
* If the analysed result is higher than the pre-programmed breath-alcohol level, the vehicle will not start.
* Interlocks in New Zealand are effectively set for a zero limit.
* Interlocks are needed not only to start the vehicle but also at random times when the vehicle is in use.
Have your say
Email us at newsdesk@nzherald.co.nz.