The crash took Northland's road toll for the year to 19, compared with 15 at the end of May last year. The Far North's toll now stands at 9.
The worst year on Northland's roads was 1989, when 55 people died. The record low toll was 7 in 2011.
The officer in charge of the Northland Road Policing Unit, Inspector Wayne Ewers, said it had been a "rough start" to the year. Investigations into Tuesday's crash were continuing, and charges could be laid.
The double-fatality comes just over a month after an American visitor was charged with causing two deaths in another Far North road crash.
US citizen Reiss Martin Berger, 21, and his partner had been in New Zealand on his first visit only hours before that crash about 11pm on April 2.
The impact killed James Hamiora and Yvarn Tepania, who were in the front seats, and injured two others in the back of the car, about 7km south of Kerikeri.