One person is critically injured after a crash in Auckland last night.

Police said a driver travelled the wrong way down the Squadron Drive on-ramp in the Upper Harbour Motorway in Greenhithe and collided with a ute towing a boat and another car.

The incident happened at around 8.15pm.

Police said the driver of the car that travelled the wrong way had critical injuries, while three passengers from the other two vehicles had moderate injuries.

The road was closed while the Serious Crash Unit examined the scene and enquiries into the circumstances of the crash were underway.