A woman riding her bicycle wreaked havoc on traffic driving over Auckland's Harbour Bridge.

A police spokeswoman said they had three calls about the woman, who is not wearing a helmet, holding up traffic as she pedalled along the bridge with full shopping bags hung over the handlebars.

The spokeswoman said they were first notified about the cyclist at 12.20pm.

Jason Howarth told the Herald he was out on his boat in the harbour when he saw the woman.

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"We were just out fishing and my wife spotted her."

He said the woman was proving to be a nuisance as he could hear cars honking their horns as they tried to get past.

"We could hear heaps of cars tooting, you could hear them from everywhere."

He took a video of the woman, which shows her making slow but steady progress across the bridge as cars drive around her.