Traffic backed up on SH8 following the fatal crash near Lake Tekapo on Saturday.
Police are looking at cell phone use and speed as potential factors in a fatal crash near Lake Tekapo.
Emergency services were called to the scene just after 9am on Saturday on State Highway 8, near Lake Tekapo Airport.
Police have named 42-year-old Che Tekapa Hogg, of Auckland, as the person killed in the crash.
Three other people who were airlifted to hospital following the crash are still in hospital with serious injuries.
Stuff understands the man who died in the crash had been seen driving erratically prior to the crash. It’s understood he crossed the centre-line and collided with the other car driven by a father whose two young children were in the back.
It’s understood police are looking at cell phone use and speed as factors in their investigation.
Senior Constable Brad Morton, of Lake Tekapo, declined to comment on the circumstances of the crash but said the fact the two children were safely secured in their car seats saved their lives.
There have been four fatal crashes over Labour Weekend.
With holidaymakers stuck in the country this year, authorities are warning the roads could be even busier than usual.
National road policing manager Acting Superintendent Gini Welch appealed for motorists to behave safely on roads after a “devastating start” to the weekend, with several other serious crashes.
“While it is too early to talk about the cause of these crashes, we will continue to relentlessly remind people we all have a part to play to keep our roads safe.
“With high volumes of traffic on our roads this long weekend, we implore you to keep your speeds down, pay attention to your surroundings and the conditions, and watch your following distances to ensure you arrive alive.”