Motorists are being urged to avoid the Mount Vincent area following a serious crash that has closed Leggetts Drive in both directions at the intersection of Sandy Creek Road. (Live Traffic)

Emergency services are on scene, with the road closed to all traffic while crews respond to the incident.

Drivers should expect significant delays and allow extra travel time if travelling through the area.

Diversions are currently in place via the M1 Motorway and the Hunter Expressway.

Authorities are asking motorists to follow the directions of emergency services and traffic controllers and to avoid the area where possible while the incident is managed.

Further updates will be provided as more information becomes available. (Live Traffic)