If you're driving, remember to check your speed, as from Tuesday the speed threshold reduces to 4km/h through until January 31, 2016.

Similar to the previous two summer holiday periods, police will be highly visible on the roads and enforcing the reduced 4km/h speed threshold as part of a targeted road safety campaign.

Police are warning motorists that the speed threshold will reduce to 4km/hr from Tuesday, December 1, through to January 31 of next year. Photo: File

This campaign will also feature a strong focus on impaired driving and other high risk behaviour meaning every driver stopped will be breath tested.

Superintendent Steve Greally says police want all families to have a great summer that is memorable for the good times.

'Not a summer ruined by the grief of losing a family member to a fatal crash,” says Steve. 'It's the loved ones that are left behind that have to carry the pain and devastation a fatal crash causes.”

Tomorrow marks the one year anniversary of the adult alcohol limit being lowered and police are encouraged that many drivers are 'getting the message” and deciding not to drive after drinking.

By the end of October 2015 there were 2,425 fewer drivers caught in the over 400mcg/80mg bracket since the new legislation came in, compared with the same period the previous year.

Steve says police would be delighted to not issue another infringement throughout the summer, or to have to knock on the door of loved ones to deliver tragic news.

'Every police officer dreads having to knock on the door of someone's family to tell them their son, daughter, parent or another loved family member has been needlessly killed in a crash.

'We'd also be delighted to never have to issue another infringement, because aside from the fact it actually costs us money to issue notices, it would show that everyone was driving safely and responsibly, and the trauma on our roads would reduce overnight.”

The previous two summers marked the two lowest ever recorded number of deaths for a December/January period since records began.

From December 1, 2014, to January 31 of this year there were 50 road deaths, compared to 42 road deaths the previous year. By comparison, the worst December-January road toll recorded in the last 25 years was 124 deaths in 1990.

'The challenge to all of us on the roads this summer is see an even better result, but we all need to play our part to make that happens,” adds Steve.

The road safety campaign is backed strongly by Safer Journeys partners ACC, NZ Transport Agency and the Ministry of Transport.