A man who survived a car crash on a Central Coast highway got out of his vehicle only to be struck and killed by another passing car early on Tuesday morning, police say.

The tragedy occurred on the Central Coast Highway at Erina just after 5.20am.

A NSW Police spokeswoman said two vehicles were believed to be driving west when they were involved in a collision on the highway, between Bonnal and Karalta roads.

The male driver of one of the cars got out of his vehicle, only to be struck by a third vehicle as it passed the crash scene.

Paramedics arrived a short time later and attempted to resuscitate the man, however he died at the scene.