Traffic delays are testing the patience of motorists in Waikato as holidaymakers head home after the long weekend.
Elsewhere, traffic was heavy but steady on Auckland's motorway network, while Wellington drivers faced a slow crawl from Ohau, near Levin.
Police say there were no major crashes, and long tails of traffic were simply caused by the volume of cars on the road.
"We've had one complaint about a cheeky driver trying to go up the shoulder of the expressway and trying to pass cars,'' said Senior Sergeant Rupert Friend of Hamilton police.
"For the huge number of motorists out there, most of them have been pretty good, but we've still got a lot of complaints about peoples' behaviour.''