State Highway 1 in Levin is closed following a serious crash.

Police were called to a single vehicle crash between Kawiu Rd and The Avenue just before 1pm.

A two-vehicle crash is causing delays on the Southwestern Motorway, Onehunga this morning.

The crash, near the Neilson Street on-ramp, was reported to Police just after 7am.

Motorists are being advised to expect delays following a crash on the Northern Motorway in Sunnynook this morning.