Northbound holiday traffic is gridlocked from Puhoi to Wellsford.
The NZ Transport Agency tweeted a video of traffic crawling along the motorway as northbound motorists approach the Johnstones Hill Tunnels.
The agency advises drivers take State Highway 16 as a faster alternative.
Traffic is expected to be busy through this area until approximately 6pm tonight for both northbound and southbound traffic.
Commuters heading south from Auckland are also facing heavy congestion between Redoubt Rd and Great South Rd.
Traffic is also reportedly heavy heading out of Wellington.
Road users are advised to expect delays and allow extra time for their journeys when travelling.