Dirt bikes have become a menace on some New Zealand streets. Photo / File Photo: Coopersgrl / Reddit

A three-year-old child has suffered severe facial injuries after his father crashed while doubling him on a dirt bike in Northland, police say.

The crash has highlighted the danger of dirt bikes being used on city streets - and an alarming trend of riders taking young children for high-speed joyrides, almost always without helmets.

Senior Sergeant Clem Armstrong, area prevention manager for Mid North police, said the Kaikohe crash involved a three-year-old boy and his father.

The child was seriously hurt and the 22-year-old rider was facing child welfare and driving charges.

Armstrong said the child was being doubled at the time of the crash.

He was unable to say more given that the case was now before the courts.

RNZ understands the child's injuries included a broken jaw and facial lacerations.

Dirt bikes were a problem in Kaikohe in particular, but there were also regular incidents in Whangārei - including the death of a rider in March last year - and in Auckland, where a group of about 40 bikes sped across fields where children were playing sport on 1 February.

"A big problem is the fact that a lot of these bikes are not warranted. They're not registered, they're not roadworthy. The riders themselves are not licensed, and some of the driving behaviour is just dangerous, reckless and unruly," he said.

Senior Sergeant Clem Armstrong, of Mid North police, says dirt bike riders are putting children in serious danger by taking them joy riding on city streets. Photo: RNZ / Peter de Graaf

"There's no consideration for members of the public and other road users, and it's just a huge safety concern for us. I've seen first-hand people who have been seriously hurt, and the absolute last thing we want is for somebody to lose their life as a result of this sort of stuff."

An alarming trend involved riders taking young children as passengers.

"A lot of the bikes that we come across, they don't have brakes, they don't have tread on the tyres. So there's just so many risks, ultimately it will lead to more people being seriously hurt."

A Kaikohe resident, who did want to be named for fear of retribution, said dirt bikes tore past his home frequently.

They created noise and nuisance and the riders put themselves at risk by pulling wheelies in traffic, but it was the danger to small children that made him "deeply, deeply anxious".

"Parents, mothers and fathers alike, will take a little, tiny baby for a ride down the street, and the child is sitting in front of them, with no restraints," he said.

"They're doing at least 50k, if not more, and the child thinks it's an absolutely wonderful thing. But they have no idea what would happen if they suddenly hit something. They would just go flying like a bag of cement and have to be scraped off the road 20 metres ahead."

That has already happened with the severely injured three-year-old, he said.

"That still hasn't stopped them. You still see it. Those small children don't have an opportunity to say, 'No, this is dangerous, and I don't want to do it'. And parents are giving them what they think is a good time."

Armstrong said no particular age group was involved, and many of the riders fancied themselves as experts.

"A lot of them, in their own minds, believe they're really good riders, but a lot of the time they're actually poor. They don't have the knowledge or experience, and they haven't gone through any sort of proper learning."

Armstrong said police took the offending seriously and would hold people to account through the courts, with tools such as CCTV used to identify offenders.

Bikes could be impounded for 28 days up to six months.

Any rider signalled to stop should do so, because fleeing could lead to charges of dangerous driving or failing to stop.

Consequences for those who stopped could be less severe, such as education.

Armstrong said thrill-seeking was often their motivation, and many had no access to bike tracks or other places to ride so they took to streets and footpaths.

"They may think it's a fun thing to do, but it's not fun when we're dealing with seriously injured people, especially kids," he said.

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