The female driver refused to undertake a breath test.

Two children, a three-year-old girl and a five-year-old boy were in the car at the time of the crash. The children sustained minor injuries.

The woman was taken to Day Street Police Station.

The crash caused three lanes on the bridge to close. Lanes have now reopened.

Traffic remains very heavy - southbound traffic is queued back into the Lane Cove Tunnel, while northbound traffic is queued back over the Anzac Bridge to Rozelle.

Bus passengers are experiencing 30 minutes delays.

Oxford Falls Road is closed in both directions between Wakehurst Parkway and Avoona Road due to flooding.

Motorists are advised to take extreme care on the roads, slow down and never drive through floodwaters.