DDI Interchange (IMAGE) University of Missouri-Columbia Caption This image shows Overview of Diverging Diamond Interchanges, or DDIs, that divert drivers to the left side of the road prior to merging onto an interstate, freeway or highway. Credit Carlos Sun 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.