A tourist was caught driving 180km/h in a 100km area in the Waikato.
He was caught on the Waikato Expressway on State Highway 1 heading north and told police he thought he was only travelling at 80km/h.
Another driver was caught travelling 157km/h near the Tahuna roundabout on State Highway 27.
Officer in charge of the Waikato Highway Patrol, Senior Sergeant Steve Ambler, said both drivers had their licenses suspended for 28 days.
"Our message here is with the roads clogged with holiday traffic you need to ensure the speed you are travelling at will allow you to react to anything another person might do on the roads and those speeds fall out of that by a long way.