Police are asking holidaymakers to drive safely on Waikato's waterlogged and increasingly congested roads.
Officers across Waihi, Whangamata, Whitianga and Coromandel had reported a quiet night with few problems.
But today, as drivers hit the rain-swept roads, traffic is becoming a major problem.
Officer in charge of the Waikato's summer policing operation, Inspector John Kelly, said: "The main issue remains high traffic volumes, particularly around the one lane bridges up and down SH25, with Tairua being a particular choke point. You need to allow for this when planning your trip and the key ingredient you need to pack is plenty of patience."
He added: "We're also reiterating our warning from yesterday about staying off the road if you've had a big night drinking as alcohol stays in your system for several hours after your last drink."