The Kaitaia Fire Brigade responded three times, immediately after the accident, at 4.23am to provide lighting, and again to wash down the highway.
Traffic in both directions was diverted via Gill Road.
A family member posting on a Kaitaia Facebook page said the trio's car had broken down, and they were trying to hitch-hike when they were hit.
It was a sleepless night for Kaitaia's firefighters, who were called to a crash just before 2am while they were still at the scene on the Awanui Straight.
The driver had apparently fallen asleep, crashed and woken up, unsure where he was.
When he called 111 he believed he was in Taipa, but firefighters eventually found his abandoned car on Spains Road, Awanui. A crew was dispatched to Pamapuria at 4.20am, after a driver reportedly swerved to avoid a dog on State Highway 1, and his vehicle ended up upside down in the roadside drain.
He had been travelling to the Awanui Straight scene to control traffic.
¦408-6500, or Crimestoppers, anonymously, on 0800 555-111.