A thief allegedly stole SADD-branded car magnets in April, and has been spotted driving erratically around Auckland since.

The actions of a man driving "erratically" around Auckland in a Students Against Dangerous Driving-branded car has been labelled a "kick in the guts" by the organisation.

Police said the car had been spotted driving dangerously in the Mt Wellington area, reportedly pulling risky u-turns and other hazardous manoeuvres.

A fellow motorist even spotted the dodgy driver disposing of a lit cigarette on a gas station forecourt in Hobsonville, metres from a refuelling car.

Students Against Dangerous Driving (SADD) national manager Donna Govorko said the move was "vindictive".

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"Our main message is about driving safely and being considerate, and obviously this person is quite the opposite of that."

She suspected the man had stolen the organisation's sign-written car magnets to make it look like he was a legitimate SADD employee.

"He's obviously seen them, stolen them off the car and now he's put them on his own car," Govorko said.

Police confirmed the magnets were stolen from a SADD Toyota Corolla on April 22 near the Okura Bush walkway on the North Shore.

Supplied SADD national manager Donna Govorko said the move was "a kick in the guts".

A police spokesman urged anyone who saw a vehicle with the SADD magnets, which was not a Toyota Corolla, to contact Police.

"The magnets are of value to the SADD organisation and we are disappointed someone would steal them as it would serve little purpose to anyone other than their organisation."

Govorko said she first caught wind of the crook's offending in late June.

"A concerned member of the public rang me up complaining that a car with SADD branding was driving dangerously.

"It was doing a dangerous u-turn in the street, that's what caught [the caller's] attention."

She said the caller told her the car, a white sedan, was being driven by an "older, rougher-looking male".

He was spotted at the service station with the branded magnets attached on the same day.

"It might be that he's going out and putting them on when it suits him – so he might not be driving with them on all the time."

Govorko, a former road policing officer, said she had a few theories as why the person would sport the SADD magnetic car signs.

"Obviously he's a thief, and I think that it gives him credibility to be able to go somewhere and be incognito, because it looks like he belongs to a reputable company," she said.

"I know all about the dangers on our road at the moment and that's why we're so passionate about trying to do our best about keeping the road toll down. That's why it's such an awful thing to know that someone is driving dangerously with our signs on them."

SADD is a charity which encourages and empowers young people to make better choices on the road through safety campaigns and education.

About 75 per cent of secondary schools – or 230,000 students – have some kind of involvement with the organisation.

Govorko said there were two cars bearing the magnetic SADD branding in Christchurch and only one in Auckland, but she had now instructed the two in Christchurch to remove theirs.

"None of our SADD cars have SADD magnets on anymore. So if you see a SADD branded car in Auckland now, report it to police because it will be him."