4.45pm: The accident site has cleared. Traffic flow has returned to normal.
4.30pm: An accident at Yallah has caused a 4km traffic jam on the Princes Highway.
Earlier: The Princes highway is partially closed following a four-car accident at Yallah.
The crash has closed one of two southbound lanes at Haywards Bay Drive.
NSW Ambulance paramedics are attending and are assessing one patient as at 4.10pm.
More to come.