Hybrid Power (IMAGE) Iowa State University Caption Two of the country's first 19 hybrid school buses are now running routes in two Iowa school districts. Iowa State University's Center for Transportation Research and Education helped bring the buses to the state. Credit Dennis Kroeger/Iowa State University Usage Restrictions None 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.