A truck has ploughed into a Porsche dealership in Epsom, injuring two people and damaging about nine luxury cars.

Police spokesman Lou Alofa said the truck was heading down Great South Rd toward Manukau when the crash happened at 11.25am.

Witnesses say a people-mover tried to do a U-turn on Great South Rd but it hit the truck, which lost control.

The people-mover "whistled" through the air and was airborne for about 10m.

Eleven cars and two trucks were damaged in the crash, and the crushed people mover was sitting on the opposite side of the road.

Alofa said some of the cars were pushed into buildings.

"We understand a number of the vehicles had occupants in them and they have sustained various injuries," he said.

Two people were taken to Auckland City Hospital, one with serious injuries and another with moderate injuries.

Inspector Cornell Kluessien said after hitting the people mover the truck "collected" a tow truck which had a car on the back of it. The truck pushed the tow-truck into the Porsche dealership "where it has hit a few Audis and Porsches along the way".

He said the people mover had also struck a few BMW's before coming to a halt.

A witness at the scene, Brian Cox, said it was like "the Dukes of Hazard".

"I heard a massive great bang, I looked up and there was carnage everywhere," he said.

The man rushed to the driver of the people-mover and said he had suffered lacerations to his forehead, but the driver was conscious and breathing.

Fire, ambulance and police were at the scene.

A large section of Great South Rd was closed.

- © Fairfax NZ News