At least two northbound lanes on the Southern Motorway, near the Mountain Rd over bridge, are blocked after a truck and at least one car were involved in a crash.
A police spokeswoman said while there was significant damage to a car involved in the crash, an off-duty paramedic on the scene had told police injuries to those involved were minor.
A second car might have been involved in the crash, which occurred about 11.20am, the spokeswoman said.
NZTA said the crash was blocking the two right-hand northbound lanes under the Mountain Rd overpass.