Police will be keeping an eye on a anti-TPPA cruise in Christchurch on Saturday.

The Christchurch man behind a planned protest cruise says his group are moving away from the boy racer scene and building positive relationships with police.

The route of the cruise, dubbed "Car enthusiasts protest against TPPA" on a publicly-accessible Facebook page, is yet to be revealed by the organisers.

Police confirmed they were aware of what was being planned for Saturday and would monitor the event and take enforcement action if necessary.

DEAN KOZANIC/FAIRFAX NZ Anti-TPPA marchers head through Christchurch's Westfield Mall during an earlier protest event.

More than 4000 people had expressed interest in attending the cruise.

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When contacted on Thursday, co-organiser Corey Nicholl said he did not expect "anywhere near that number" to show up, but it was hard to say how many would.

"Our average cruise for our group is around 2-300 cars."

Senior Sergeant Matt Emery said police were aware the cruise was being organised, having taken a look through the Facebook page themselves.

"We are aware of multiple events relating to the TPPA [being held on Saturday].

"If there's no offences committed then we're happy."

Any anti-social or disruptive behaviour would result in enforcement action though, Emery said

Nicholls said the event was linked to other TPPA protests happening in the city on Saturday.

"We are a car group who do regular runs around Canterbury, who have gained a lot of respect from a lot of police over the last few years while moving away from the 'boy racer' scene, and starting to get a good name out there for our trouble-free cruises.

"With the TPPA protest going on around town, and a lot of our group disapproving with the TPPA for each of their own reasons, we just thought we would have a small protest in our own way," Nicholls said.

He conceded organisers could not control the actions of all attendees, but would take steps to remove anyone causing trouble.

"It's the same as everything, you do get the odd trouble maker, but it comes down to how you deal with this and try to stop it from happening in the future," Nicholls said.

Police had been in touch with Nicholls following cruises, saying they were "impressed with how they are going", he claimed.

As for the trade agreement, Nicholls said those in his group were not concerned about how it could affect them personally.

"It's about how it could affect the country we live in."

TPPA EXPLAINED

The TPPA is a trade deal involving New Zealand and 11 other countries.

As a result of the deal, the taxes paid on imports from member nations will be lowered or eliminated.

The Government says the deal will add $2.7 billion a year to the country's economic output by 2030.

Critics say it will give other countries and corporations undue influence over our laws.

The deal will be signed in Auckland on February 4, but will not come into effect until all countries ratify it.