Helmet Crash Tests (2 of 2) (IMAGE) University of New South Wales Caption A crash test dummy used in a UNSW-led study which showed that crashing without a helmet exposes the head to accelerations and forces up to 9.5 times greater than with a helmet. Credit UNSW Usage Restrictions In association with a report on the research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.