Three people have died in a campervan crash near Geraldine, while two have been killed after a head-on crash on the Waikato Expressway.

Police were advised just after 1am that a campervan had collided with a barrier in Te Moana Road and caught fire.

All three occupants of the campervan were killed, says police.

The road was closed while the Serious Crash Unit worked at the scene.

In the second incident, police say it appears that one of the cars was travelling the wrong way along the Waikato Expressway.

The drivers of both cars died at the scene, police say.

The road was closed in both directions and diversions were in place.

One person has died after a crash on Baylys Coast Road in Dargaville this morning.

Police say a car appears to have collided with a tree. The driver died at the scene.

The road is expected to remain closed for several hours and diversions are in place.

-RNZ.