Woman killed in northern NSW highway smash

A woman is dead and three others are injured after a head-on collision on the Pacific Highway in northern NSW.

The 32-year-old's car collided with another coming the other way at Glenugie, south of Grafton, just before 7pm on Friday.

Police said the woman died at the scene.

Three passengers in the other car were taken to hospital with minor injuries, while the 47-year-old male driver was taken for mandatory testing.