A high-speed crash ripped a Nissan Skyline in two and critically injured the occupants.

A high-speed crash that ripped a "super car" in half left two men strapped to their seats in a dark paddock, one of them screaming for help.

The engine and transmission of the Nissan GT-R, which police said would have been worth over $100,000, was left lying on Koromatua Rd after the driver lost control and struck a tree at 4.15am on Friday.

The remainder of the car, with its two passengers onboard, ploughed through a fence into a paddock. It came to a stop 30 metres from the road near a waterway.

MARK TAYLOR/FAIRFAX NZ Remains of a serious crash that ripped a $100,000 car in two on Koromatua Rd near Hamilton.

Police said the crash was the first of 17 in the Waikato between 4am and 1pm on Friday.

Seven of those were in Hamilton and 10 were on rural roads in what police said were perfect driving conditions.

In Temple View, south of Hamilton, sleeping residents woke to the bang as the Nissan GT-R spilt in half.

MARK TAYLOR/FAIRFAX NZ Two men, one conscious, were left strapped to their seats after a high speed crash.

"There was just a great whack," said a nearby resident who declined to be named.

"I got a torch. One guy was screaming and the other was unconscious."

He said the driver, who was conscious, suffered severe leg injuries that had severed part of his foot.

Both men remained strapped into their seats with nothing but farmland and darkness in front of them.

"It was pretty dark, pretty creepy. The guy was just screaming, asking for water. My wife phoned the ambulance and I was pretty much trying to wave people down."

The bang also woke Wendy Booth, who provided first aid.

"The guy in the car was yelling, calling out. He was in a lot of pain.

"We couldn't quite figure out where they were until we saw the neighbour's torch flashing in the paddock. It was grim. I just did what I could to help them."

Booth, a retired air crash investigator, said that despite severe leg and foot injuries, the artery was not struck, which may have saved the driver's life.

"I'm amazed. It's just pure luck they were alive. The whole front [of the car] was gone."

Booth said both men were wearing boardshorts and appeared to be in their 20s or 30s.

"They both had sore tummies, so they must have had seatbelts on."

Constable Heath McFarlane said speed was a factor.

"They came over the rise of the hill and appear to have hit an undulation in the road. The driver appears to have braked heavily and they have hit a couple of trees."

He said the impact split the car in two, causing the transmission and engine to rebound back on to the road.

"The other piece has continued into the paddock. The driver and passenger were still in their seats."

He said the GT-R was heading west towards Tuhikaramea Rd.

"It is a very fast car. Neighbours could hear them winding up," McFarlane said.

Firefighters used the jaws of life to strip the roof off the car and cut the pair free.

"They are extremely lucky to be alive," McFarlane said.

"How they walked away from this I have no idea, [except] they won't walk away.

"If the car had kept going, it would have hit the waterway. They may have drowned."

Both men were taken to Waikato Hospital with critical injuries. At 9am on Friday, one was in intensive care and the other in the emergency department.

Police Serious Crash Unit was investigating and looking at a number of factors including speed and alcohol.

Hamilton police Senior Sergeant Andrew Townsend said there had been a spate of accidents around the Waikato.

Two people were taken to hospital with moderate injuries after a motorcycle and car collided on Grey St and another two cars crashed on Bankwood Rd, Chartwell.

A four tonne truck rolled onto its side blocking the southbound lane of SH25A at Kopu and at 2pm emergency services were called to another crash on SH25 Tairua-Whitianga Rd.

Townsend said people needed to slow down and not be distracted.

"It is perfect driving conditions out there, just stay alert, don't be distracted by phones, or anything on the roads, and take care."