We're into day four of the traffic light system and, for many of us, it's taking a bit of getting used to.

Vaccination passes, under the system, are required for entry in a range of public settings.

Prime Minister Jacinda Ardern told Morning Report there haven't been widespread issues with fake passes being used.

She's also defended the decision to have Auckland in a red light, amid calls from opposition leader Christopher Luxon to free up restrictions in the supercity. 

"While we're in a transition phase, we want to make sure we step into this easing carefully.

"We've seen overseas, if you pull the brakes just too quickly, it can end in disaster and a quick flip into restrictions. We don't want that," Ardern said.

Cafés and even councils around the country are making their own decisions on how they'll operate within the new guidelines.