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Center for Transportation Studies


An Observational Study of Pedestrian and Bicycle Crossing Experience in Two Modern Urban Roundabouts

Thursday, September 29
3:30 – 4:30 p.m. CDT
Room 1130, Mechanical Engineering Building

Part of the Fall 2011 Advanced Transportation Technologies Seminar Series.

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About the Seminar

Many cities in the U.S. are installing roundabouts instead of traditional signalized intersections, largely due to evidence that roundabouts dramatically reduce fatal and severe injury crashes. However, the impact of roundabouts on pedestrian safety is not clear. In this seminar, John Hourdos discussed a research project aimed at investigating pedestrian accessibility in Minnesota's urban roundabouts and addressing complaints from pedestrians regarding intersection crossing and safety issues.

The project involved the observation and analysis of interactions between pedestrians or bicycles and vehicles at two modern urban roundabouts in the Twin Cities area. The researchers examined factors such as who yielded, the location of the crossing, the number of subjects involved, and the conditions inside the roundabout before the interaction occurred. Hourdos also reviewed the study's results, which highlight and categorize the existence of friction between pedestrians and drivers at roundabout crossings.


John Hourdos is the director of the Minnesota Traffic Observatory and an adjunct assistant professor in the Department of Civil Engineering at the University of Minnesota. His research focuses on microscopic simulation, traffic model calibration, and incident detection and prevention.

More Information

Contact Shawn Haag, 612-625-5608 or