A crash involving a truck and a car is delaying traffic in both directions on State Highway 1 north of Puhoi.

The NZ Transport Agency said anyone driving north of Puhoi should expect delays in both directions and follow instructions from emergency services.

However, another accident between a truck and car which blocked northbound traffic on the Southern Motorway near Greenlane this afternoon has been cleared.

An agency spokeswoman said no issues with surface flooding or weather-related incidents had been reported anywhere on the Auckland motorway network so far.

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"But in anticipation of bad weather, we advise motorists to slow down, take extra care, observe safe following distances and turn their headlights on," she said.