Witness backs police call to Taser driver

An irate driver with head injuries who had to be Tasered by police following a car crash was "wound up on adrenaline", says a witness.

Earlier this week the Times-Age reported on the two-car crash near Pirinoa, on the corner of Lake Ferry and Pouawha Rds on Saturday.

Police had to use a Taser to stun the man after he became aggressive towards other drivers and the police.

The good samaritan, who did not wish to be named for fear of retaliation, said he and his pregnant wife were in one of the first cars to arrive at the scene of the two-car smash.

They stopped to offer assistance but his wife quickly got back in the car when they were confronted by the driver of a utility vehicle, whose car had been in collision with another car.

The man looked like he wanted a fight and did not seem to realise what had happened, yelling "who was it? who was it?" as he headed towards the occupants of the other car, he said.

"He had blood p*****g out his head and he was obviously wound up on adrenaline ... it was pretty obvious that he was going to attack us so I said to him in a calm voice and trying to be non-threatening 'are you all right?'." The driver was incoherent and talking nonsense, the bystander claimed.

"When he was coming towards us, I've never seen anyone that furious ... I couldn't turn my back on him."

A friend and teammate of the driver then arrived and tried to calm him down.

The witness said although he did not see the police shoot the driver with a stun gun, he could see why they felt it was necessary.

Life Flight's Westpac rescue helicopter transported the man to Wellington hospital.

He was treated for head and leg injuries and at last report was in a stable condition.

Police said it was likely charges will be laid.