Auckland weather: Thick fog prompts warning for motorists

Auckland motorists are being warned to be extra careful as fog blankets the city.

The New Zealand Transport Agency (NZTA) has warned motorists the roads could be tricky due to poor visibility.

"Take extra care driving around the #Auckland network this morning with thick fog around.  Watch your travelling distances and allow extra time for your journey," it said on Twitter.

A crash has already caused problems on the motorway network, with traffic headed south from the city slowed by a crash just before the Grafton Rd overbridge.

The crash was pushed clear at around 6:45, but the NZTA has warned road users to be aware congestion in the area is likely.

A spokesperson for Auckland Airport told Newshub flights have not been affected by the fog.

Newshub.