Traffic circles create irregular traffic patterns characterized by continuous vehicle weaving and lane changing. Because of this, circles are a potential source of confusion to drivers. Therefore, a study was conducted to determine whether improvement of guidance signing used at traffic circles would lessen confusion and increase safety. Five circles were selected as test sites, and diagrammatic guidance signs were installed at the approaches under study. The five circles were individually videotaped for 2 days before and 2 days afterinstallation of the signs. The results of conflict analysis at all five circles indicated that the diagrammatic signs effectively reduced the number of confusion-oriented conflicts. This paper appears intransportation research record no. 1327, Visibility, rail-highway grade crossings, and highway improvement evaluation 1991
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