Protest organiser for Real Choice Julia Espinoza says she is "absolutely wrapt" with how today's Trans Pacific Partnership march played out in central Auckland following the controversial signing of the 12-nation agreement.

"We didn't know how many people to expect on the day, but we've had thousands…throughout the day."

We've had heaps of people come and join us and really good public support as well."

Ms Espinoza says they set out to hold a peaceful protest and that had been blown out of proportion by the media and the police.

"No one was planning to go and riot anywhere, we had no intention of trying to get into SkyCity. We wanted to go and show that direct action does work in a peaceful manner.

We made lots of noise and a really strong message to those leaders that we don't want this agreement."

Police warned motorists of angry TPP demonstrators blocking the Harbour Bridge off-ramps, while one group stopped traffic entering the southern motorway.

Break-away groups have forced major routes to come to a stand-still, forcing major delays for vehicles crossing the Harbour Bridge and trying to navigate Queen St.

Police claim some are running into traffic without warning.

Newshub reporter Lisa Owen says protesters are "causing maximum disruption with a minimum group of people" and exhausting police resources.