Holidaymakers returning to Wellington this evening face a long trip, with traffic flows slow from as far back as Waiouru.
Those heading back to Auckland face similar woes, and police are urging motorists to be patient.
In the south, roads around Christchurch are being described as extremely busy, while Dunedin is moderate.
The Automobile Association's Mike Noon says motorists should prepare for a slower-than-usual trip.
Five people have died on the roads this holiday period, which officially winds up at 6am tomorrow.
RadioLIVE