Bay pre-schoolers let rip in their decorated wheels around Tauranga's ASB Arena.
More than 500 children from 20 Bay of Plenty Kidicorp centres took their cardboard cars along to the Kidicorp Box Car Derby today.
Check out a video of the box car derby below
Children between the ages of two and five committed a lot of creativity to transforming their cardboard boxes into vehicles for the derby, said Kidicorp professional services manager Michela Homer in a statement.
"Some centres held nights when the parents could come in and help. It's been great to have the families involved and the children are super-excited about it all."