His research interests include work zones, safety, legal issues, traffic engineering, ITS and planning. He won the Researcher of the Year award from the Missouri Department of Transportation and the Best Research Award from Intelligent Transportation Society of America with PATH. He has received funding from the National Science Foundation, the U.S. Department of Education, the Federal Highway Administration, the Midwest Transportation Consortium, the Delaware River Port Authority and the Missouri, Kansas and California departments of transportation. He is a registered professional engineer in Missouri.