Motorists in and around West Auckland are being warned to expect delays this afternoon following the closure of a major motorway on-ramp after an earlier crash.

Authorities have closed off the Lincoln Road on-ramp this afternoon.

Emergency services were called to the area after reports of a crash between a car and a ute on a northbound lane of the north-western motorway just after 1.30pm.

One person suffered moderate injuries in the crash, the Fire Service said, while two others sustained minor injuries.

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Fire Service spokesman Jaron Phillips said there was a large amount of debris - understood to be large rocks - on the road, which needed to be cleared.

The NZ Transport Agency alerted motorists via its Twitter page: "Expect major delays and avoid area if possible.''