"So if we can avoid that for as many families as possible it's a very positive thing for everybody."
The official holiday period began at 4pm on Friday. It is the first time since records began in 1956 that there have been no deaths on New Zealand roads during Queen's Birthday weekend.
Seven people were killed in four fatal crashes over the same weekend last year - a rise from the single death in 2011 and two deaths the previous year.
Mr Cliff said "back in the bad old days of the early '70s" the worst Queen's Birthday weekend toll was 24 deaths, and a lot of progress had since been made around road infrastructure, vehicle safety and driver attitude.
"We've made tremendous progress, but one death is too many and there's still too many people who are being hurt, and we can still improve the way we drive.''
Police applauded the responsible driving displayed over the month of May, said Waikato District Prevention Manager, Inspector Rob Lindsay.
It was the second fatal-free Queen's Birthday holiday weekend on Waikato roads, and police commended drivers on their mature approach behind the wheel in recent weeks.
"Our staff have reported drivers dropping their speeds and being more considerate to other road users, which has corresponded with worsening winter road conditions.
"We believe this reflects well on the inter-agency social driving campaign associated with the Safer Journeys strategy which is aimed at the community being responsible for safer driving."
Easter last year was the first zero road toll for a public holiday since records began in 1956.
Three people died during Easter weekend 2013.
QUEEN'S BIRTHDAY ROAD TOLL
Highest: 24 deaths in 1973
Previous lowest: 1 death in 2011
Last year: 7 deaths in 4 crashes
This year: No deaths