Piezoelectric Sensors in Indiana Highways (IMAGE) Purdue University Caption Sensors developed by Purdue engineers are being embedded into Indiana highways to determine when concrete is mature enough to open up traffic following a construction project. Credit Purdue University photo/Erin Easterling 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.