Smart Bridges (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories mechanical engineer Stephen Neidigk positions a Comparative Vacuum Monitoring sensor on a bridge. In his other hand is the control system that periodically checks the sensor and a wireless transmitting device to autonomously alert the maintenance engineers if it detects a crack. Credit Photo by Randy Montoya Usage Restrictions Credit Randy Montoya/Sandia National Laboratories 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.