Hesham Rakha (IMAGE) Virginia Tech Caption Hesham Rakha, director of the Center for Sustainable Mobility at the Virginia Tech Transportation Institute, and his research group study drivers' behavior as they approach yellow lights in order to determine signal times for intersections that are safer and still efficient. Credit Virginia Tech 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.