Get up at the crack of dawn. That's the advice being given to motorists planning to head out of town in the lead up to New Year's Eve.

Roads to top Kiwi summer holiday destinations are at their busiest during the middle of the day, according to the NZ Transport Agency.

State Highway 1 heading north towards Wellsford is likely to be busiest between 1pm and 5pm, and traffic will build up from about 9am.

READ MORE: Car vs truck crash brings road toll to 6

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The agency suggests holidaymakers pack their cars the night before and head off first thing the following morning.

"Roads will be quieter and you'll be able to put your feet up and relax much sooner," spokesman Rua Pani said.

The agency would update traffic conditions on Twitter and congestion maps would show where and when traffic is likely to be particularly heavy.

NZTA on Twitter:

Auckland and Northland

Waikato and Bay of Plenty

Central North Island

Wellington

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Canterbury and West Coast

Otago and Southland

Waikato police have urged motorists to slow down after a driver was clocked at 151km/h and another travelling north on the Waikato expressway were caught at 180km/h.

Senior Sergeant Steve Ambler of the Waikato Highway Patrol said traffic to Coromandel and the Bay of Plenty was particularly built up at the intersection of SH2 and SH26 at Paeroa and the intersection of SH1 and SH29 at Piarere, where drivers head towards the Kaimai Ranges.

In the Far North today, three women were injured, one critically, when their car and a truck collided on State Highway 11 at Haruru.

And in the Selwyn District near Christchurch, a young person died in a crash between a car and a truck, taking the holiday road toll to six.

Traffic chaos on Auckland's South Western Motorway after a van rolled this afternoon. Photo / Daniel Hines
Traffic chaos on Auckland's South Western Motorway after a van rolled this afternoon. Photo / Daniel Hines