"Drive to the conditions and watch out for surface flooding, slips and fallen trees or branches. Check your intended route for hazards or disruptions before setting out, using the Waka Kotahi interactive Journey Planner website (journeys.nzta.govt.nz), and remain alert for unreported hazards."
MetService meteorologist Angus Hines says parts of the Coromandel Peninsula, including Whitianga, have already reported over 30mm of rain this morning, with more on the way.
"Heavy rain warnings remain in force throughout Coromandel and Bay of Plenty until this afternoon, which could cause surface flooding and slips in these regions. Drivers should also be wary of poor visibility during heavy rain."
Mr Campbell asks motorists to be mindful of contractors who could be out clearing hazards off the road, and drive slowly through worksites.
"We want to see everyone get home safely. Stay safe and stay alert."