Abstract
The modern roundabouts are proliferating rapidly in the United States and Wisconsin is no exception to this trend. The growing number of U.S.-specific research has played an important role in their acceptance in the United States. However, as new data become available, there is a need to continue the research to better understand roundabout safety in the United States. Moreover, the growing data sets also warrant the creation of localized models to better reflect ground conditions. The objectives of this research were to continue and enhance research efforts on the roundabout safety using current data sets. The aim was to analyze roundabout crash trend and patterns to further evaluate their performance under varying situations and develop crash prediction models. The results showed interesting observations as far as crash patterns at roundabouts were concerned. Even though crash severity was reduced, it is not the same situation for crash frequencies. Further research is required to assess the safety effectiveness of roundabouts in Wisconsin. The crash prediction models from this research would help in quantifying roundabout safety, especially when selecting which locations to be converted to roundabouts.