A study of young drivers by Otago University shows one in four of them crash while on their restricted driver's licence.
The study of 893 teenagers also showed 80% of them broke at least one condition of their licence, by driving either unsupervised at night or unsupervised with passengers.
Co-author Rebecca Brookland said it's not surprising that 25% of restricted drivers crash, given they are so inexperienced. She said the research also adds to international evidence showing that the way parents drive influences their children's driving style.
Dr Brookland said motoring safety policymakers should be aware that parents are not always going to be the best role model for children learning to drive.