A two-car crash is causing heavy congestion on State Highway 1 south of Warkworth.

A fire service spokesman said one person was injured, but not trapped.

The crash occurred between Woodcocks and Toovey Rds.

A woman who drove past the scene said there were several ambulances and police cars attending the incident.

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Firefighters were directing traffic, which she said was heavy in both directions.

The NZTA has advised motorists to expect delays.