Protester Lisa Prager was arrested for damaging a traffic island on Garnet Road when Auckland Transport last attempted works in the area.

Police have arrested an anti-cycleway protester who attacked an Auckland traffic island using a crowbar and sledgehammer.

Point Chevalier resident Lisa Prager was arrested about 2.30pm on Thursday for wilful damage after she started demolishing the traffic island on Surrey Crescent, Grey Lynn.

lisa is very good with a sledgehammer pic.twitter.com/c1iEfhaRdS — David Farrier (@davidfarrier) March 15, 2018

JACKSON THOMAS/STUFF Lisa Prager was arrested for damaging public property.

The island, installed by Auckland Transport (AT) last year as part of a new cycleway, was unsafe, she said.

"Auckland Transport have done nothing so I have taken matters into my own hands," Prager said.

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JACKSON THOMAS/STUFF Lisa Prager has been camped out a nearby traffic island for months calling for the removal of the cycleway.

Prager is the ringleader of a series of protests against AT projects.

She, along with a number of other protesters calling themselves "Occupy Garnet Rd", have been camping out on a separate traffic island on nearby Garnet Rd for months, calling for the removal of the cycleway.

On Thursday she took matters into her own hands.

JACKSON THOMAS/STUFF Lisa Prager used a crowbar and sledgehammer to dismantle the traffic island.

"As soon as these stones go they will have to come clean it up and if they decide to rebuild it, I'll rip it back up."

AT spokesman James Ireland said it was completely unacceptable to destroy public property.

"Having a sledgehammer to destroy that property puts the public at danger as well," Ireland said.

JACKSON THOMAS/STUFF Lisa Prager says the traffic island is dangerous.

Prager and partner Verity George own and operate local Westmere cafe Garnet Station.

She claims the new cycleway will impact her business by reducing the number of carparks available.

Late last year AT decided to hit pause on the 2 kilometre Surrey Cres to Garnet Rd cycleway due to issues with both design and construction of the project.

SIMON MAUDE/STUFF Lisa Prager at the Garnet Rd roadworks protest in November.

Elements of the cycleway design were being reviewed however, certain elements needed to be completed, such as intersection improvements, in order to make them safe and usable where possible.

Prager believes transport and roading changes being made by AT are "designed to assist multinational corporations to transfer public money into private hands via confidential contracts".

Alternative transport lobby groups like Bike Auckland and Generation Zero along with blogs like Greater Auckland were a part of a global conspiracy called Agenda 21, she said.

Agenda 21 is an action plan of the United Nations which aims to work towards sustainable development however, some groups believe it is a plan to deprive nations of their sovereignty.

In January, fellow activist Penny Bright was arrested after trying to stop pōhutukawa trees from being relocated to make way for a different cycleway project.