Variable Speed Limit (IMAGE) University of Missouri-Columbia Caption Praveen Edara found that using variable speed limits similar to this one in construction zones may ease congestion, reduce crashes and make work zones safer for both workers and travelers nationally. Credit Steve Schar 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.