A "massive branch" has fallen on a vanload of people on State Highway 2, near the former Mr McGregors fruit and vegetable stall at Te Puna.
A reporter at the scene says the van is believed to have four men inside when the branch fell on it.
“It appears they are not injured and are waiting for a tow truck.
“A witness who watched it happen said the van ‘was full of guys.’
“Another person stuck in traffic says they have been waiting for that particular tree to come down for a while.”
Police and emergency services are at the scene.