One person is seriously injured and traffic is backed up after a crash in Wellington.

The two-car crash happened on State Highway 2, near the Ngauranga interchange, shortly after 7am.

One person was trapped.

Wellington Free Ambulance took one person with serious injuries and another with moderate injuries to hospital.

Advertisement

The NZTA is warning of significant delays for those travelling towards Hutt Valley.

A second crash is blocking the centre and right northbound lanes on SH1 before the Aotea Quay onramp.