Delays after three cars and truck crash on Southern Motorway

Auckland's Southern Motorway is down to one lane after a crash involving a truck and three cars.

Motorists should expect delays and congestion after a four-vehicle crash on the Southern Motorway this afternoon.

All lanes are now open but traffic is heavy in both directions after the pile-up.

Three people were injured after three cars and a truck collided just north of Princes St heading into the city at 12.20pm.

The truck was on its side, straddling two lanes.

A Fire and Emergency spokesman said three people were injured, but none seriously.

Those heading to Auckland Airport were warned travel times would be longer than normal.