A local resident driving past the scene said several police cars were parked at a property opposite a strawberry farm.
"[Police officers] were all standing on the driveway and there was a blue BMW parked just in front of the police cars.
"I didn't see an ambulance, but there were a lot of police there.''
The woman, who asked not to be named, said people often stopped their vehicles in that area and crossed the road to go to the strawberry farm shop to get an icecream.
Locals often complained how dangerous this was, she said.
Another woman who contacted the Herald said she and her mother were heading southbound on the highway when they saw up to six police cars outside the property.
A sheet covering a body could also be seen from the road, she said.
"[There were] a few people running back and forth across the highway.''
AUCK: Delays on SH16 Kumeu near Taupaki Rd due to an serious accident on a commercial property rm