Warning: Language. Pauli Mac posted this video of a road rage tirade on Facebook. It was since deleted, but not before it was handed to police.

A driver versus cyclists road rage video that featured on a New Zealand Facebook page has been handed to police in the hope the driver will be prosecuted.

Threats against cyclists on the NZ Drivers against idiot cyclists Facebook page have compelled complainants in Hamilton and Dunedin to give police material from the page. Neither complainant would be identified.

The Hamilton complainant said that among material he handed to police was a video filmed by a member of the page with the Facebook name Pauli Mac while he was driving and passing a group of cyclists.

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Several people had posted pictures of cyclists on the Facebook page which they had taken from mobile phones while driving, a complainant said.

But Pauli Mac had "foolishly posted a video of his own dangerous driving on encountering a group of cyclists", the Hamilton complainant said.

"The post and the video were removed after dozens of comments and once he realised he'd given away his own identity," he said.

"But not before I could capture the video, screenshots and report them to the police."

The complainant hoped police would follow the lead of United States police who, in a landmark case, charged Alabama driver Keith Maddox with reckless endangerment for similar behaviour two years ago.

Hamilton police confirmed they had received material from a complainant and had assigned an officer to the case.

A woman who has laid an official complaint with Dunedin police, along with screenshots from the page, said she became fearful about the purpose of the drivers' Facebook page after she was blocked from contributing to it.

The woman, who said she was an advocate for educating people about cyclists, said she had begun turning a few members' attitudes around but the conversations were deleted.

"I got quite scared reading the page," she said.

"Every time I went out cycling I started to worry about who was around me, who was in a car and what they were thinking. Do they want to kill me?"

The Hamilton complainant said he wouldn't be identified because of fears for his own safety.

"There are some very unpleasant people posting on that page," he said.

"I'm very concerned that there is potential for a small number of idiots to actually go out and cause deliberate harm to cyclists as a result of that page."

Such is the concern about comments, images, and videos and posts involving cyclists on the Facebook site, others around the country might also have lodged complaints against the site, the complainants believed.

Administrators of NZ Drivers against idiot cyclists denied their site was a "hate page" and said they were trying to control death threats against cyclists on the page, after another woman, Dunedin cycling mum Lara Hearn-Rollo, raised concerns and said the page should be shut down.

Hearn-Rollo said the page was carrying posts that incited members to "mow" down cyclists.

It did not just target irresponsible cyclists as its title suggested, but was directed at the cycling community as a whole, she said.

But the administrators said they were not anti-cyclist, had nothing to do with some comments and images posted on the page, and did not condone them.

They issued a statement on the page, saying it was "not a hate page".

"We do not condone any ill will towards cyclists at all. And we don't want them all off the road," the statement said.

"We are trying to keep on top of death-threat comments as we see them, which is hard to keep up at times as some of you get heated.

"We want safer riding on the road and cyclists to take more care in their surroundings."

Hearn-Rollo said her children often went cycling through the city and some of the page's contents terrified her.

Posts on the page included an image of riders in a road-cycling group being thrown in all directions as a car ploughed through them, she said.

In another post video of a cyclist knocked off their bike, was captured as they were falling under the wheels of a vehicle.

The image was reported but not removed.

Some users had posted comments offering suggestions on how to cause a cyclist injury, such as by throwing bottles of urine at them or sticking things through the spokes of their wheels, she said.