People travelling the highways over the next couple of months are being advised to check in with the New Zealand Transport Agency's winter journeys webpage.
"As the weather starts to become more wintery we are reminding people to be careful as the temperatures drop," said NZTA's journey manager for Napier, Oliver Postings.
While the opening days of the second month of winter were reasonably mild and dry, wet weather, and resulting wet conditions across the highways, is forecast later in the week.
A WeatherWatch spokesperson said low-pressure systems which had brought some showers last weekend were continuing to roll in from the Tasman.
The incoming lows were described as "large and lazy" - not overly aggressive but they would bring wet conditions over the Bay and most of the rest of the country as well from Thursday.