About 1.30pm, emergency services were called to Freemans Drive, Cooranbong, following reports a motorcyclist and a car had collided.

Bystanders conducted CPR on the male motorcycle rider until NSW paramedics arrived at the scene.

The man died a short time later. He is yet to be formally identified.

The male driver of the vehicle was taken to Wyong Hospital for mandatory testing.

About an hour earlier, emergency services were called to Fishery Point Road, Morisset, after reports a pedestrian had been struck by a car.

Emergency services arrived at the scene and found a man suffering critical injuries. He died at the scene.

A male driver was taken to Wyong Hospital for mandatory testing.

A report will be prepared for the Coroner on both incidents.

Freemans Drive and Martinsville Road, at Cooranbong are closed, as is Fishery Point Road, at Morisset.

Local diversions are in place at both scenes while police carry out their investigations.

Police are urging the public to avoid the area until further notice.

The incidents have caused traffic to back up at both sites, and the road closures are expected to remain in place for some time.

Anyone who has dashcam vision or witnessed either incident is urged to contact police.

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000.