One commentator says enforcement is critical for road safety.

The Government's announced it wants 3.3 million roadside alcohol breath tests a year, with a $1.3 billion budget over three years.

$7 million is for incentives for police - for when they meet targets.

Greater Auckland transport blog director Matt Lowrie says police haven't done enough breath tests for a long time.

"It's only in the last year that they've actually started doing it - the numbers that they kind of need to do to be able to get that down. And what we've actually seen is that in the last 18 months, the number of deaths on the road has finally started coming down again."

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