Steve Laurence Holman, 42, died when the Porsche Boxster he was driving crashed into trees in Taupiri about 5.30pm last Thursday.
Then about an hour later Thomas Blythe, 32, died when the car in which he was a passenger crossed the centre line into the path of a another car on State Highway 3 at Rukuhia.
Mr van der Velde said motorists needed to drive to survive with summer approaching.
"My team will continue with the high visibility and increased enforcement, but motorists need realise they are operating a piece of equipment that will kill, and quite often it is not the driver that dies, but a close family member or friend."