17/09/2017 11:00 AM AEST | Updated 17/09/2017 11:01 AM AEST

Picture Perfect: Thousands Cross Harbour Bridge For Annual Running Festival

Sydney's Running Festival is underway.

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Thousands have taken part in the Sydney Running Festival.

Sydney has turned on a picture perfect day for more than 30,000 runners participating in the city's annual running festival.

Under clear skies on Sunday morning, an estimated 33,000 running enthusiasts, fun runners and families took part in the yearly event.

It included a marathon for serious runners as well as a half marathon, 10 kilometre run across the Harbour Bridge and 3.5km fun run.

Shota Hattori took out the marathon in a time of 02:15:16. The women's marathon was taken out by Makda Harun Haji, who clocked a time of 02:28:04.

The event is causing headaches for motorists in the CBD, with the Harbour Bridge closed until 11am.

There are road closures in the CBD, North Sydney, Pyrmont, Surry Hills and around Centennial Parklands that will reopen at 1.30pm.

Alternate bus routes will be operating throughout the day including additional train services to Milsons Point.