The Hampton Downs circuit is right next to SH1.

Supercars CEO Sean Seamer said work is already underway to sort out a potential traffic nightmare by having the New Zealand round of the series at Hampton Downs.

While the circuit in northern Waikato is a modern facility and the track's design provides entertaining racing, a major downside is its close proximity to State Highway 1.

The Supercars round at Pukekohe was New Zealand's biggest sporting event last year, attracting 114,000 spectators.

CHRISTEL YARDLEY/STUFF Hampton Downs race track is about 25 minutes south of Pukekohe.

If those numbers come to Hampton Downs at Anzac weekend - where the event is being transferred because of a noise restriction at the Pukekohe venue = it could cause horrendous congestion issues, blocking up the motorway.

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But Seamer says they are used to dealing with issues of this nature at other rounds in Australia.

"Getting people in and out of any venue is a priority, because it can be frustrating to the people attending the event and also people who aren't attending," Seamer said.

"Transportation planning is already underway, our guys are the best in the business, they're already working through park and ride and other plans for flow.

"There is more parking there than there is at Pukekohe and the guys are working through that now."

One option Supercars uses in Australia is to put on a support race after the main Supercars race.

This staggers people wanting to leave, as some spectators would want to watch this race, while others will prefer to head home.

ATEED destination general manager Steve Armitage said they are also working on solutions to get people in and out of Hampton Downs.

"As we've worked our way towards making the announcement, we have been looking at a number of issues," Armitage said.

"One is how do we activate the track, because an event of this scale is something and new and exciting to be held at Hampton Downs.

"But the traffic in and out, particularly over a holiday weekend is something we're very mindful of and we've already started to put together a traffic management plan as to how we'll be able to make that work, which will incorporate park and ride options at various points.

"The detail is still to be put together but it's certainly something we're across."

Seamer and Armitage anticipate a similar number of spectators wanting to go to Hampton Downs as went to Pukekohe Park last year.

Auckland Council's Franklin Board said it is "obviously disappointed" at Pukekohe losing the event this year.

"There is a lot of unseen benefit on top of the economic activity - playcentres running carparking for fundraising, and that sort of thing," said the chairman, Andy Baker.

He had been closely involved in the creation of the regional planning blueprint, the Unitary Plan, and said he had no idea the Anzac Day restriction was included in it.

"Where the hell does that come from? " was his reaction when he heard the single line relating to the race track precinct existed.

Baker said activity on Anzac Day had never been discussed as a local issue when the Unitary Plan was being developed, ahead of its sign-off in 2016.

"It has come from the Independent Hearings Panel (which heard submissions on the draft plan) and was unnoticed."

Baker was confident Pukekohe would regain the event in 2021, but admitted he did not have a good feeling when he first heard of the temporary shift to Hampton Downs.

"I'm pretty confident the Pukekohe track will stand up to that sort of competition," he said.