A woman has died in a single-car crash in Maungatoroto.

Police were called to the crash on Whakapirau Rd, near the intersection with State Highway 12 at 1.25pm after a member of the public noticed skid marks going off the road and down a bank.

The car was found on its roof and the driver and sole occupant had died at the scene.

The Serious Crash Unit is investigating.