One person suffered minor to moderate injuries when a car and light truck collided on Glasgow St at approximately 12.20pm on Monday.
Whanganui Police attended the scene of the accident that occurred beside St John's Club.
A witness who did not want to be named said she was taking her mum to work when the accident occurred.
"I was on the opposite side of the road. The truck was parked and was starting to pull out. He didn't see the car and they just hit," she said.
"I parked on the side of the road, looked over and the driver of the truck had been thrown into the passenger's side. He was bleeding, I think his head was bleeding."
The witnesses mum is a nurse, she provided aid at the scene as a few other vehicles also stopped to see what they could do.
A police officer interviewed witnesses at the scene as a second swept debris off the road.