Safest designs were roundabouts with separate cycle paths outside the motorist circle and motorists had priority over cyclists. Contact Elliott for copy of summary. Good info on 38 U.S. roundabouts with detailed studies on 3 different types. Excellent safety for motor vehicles. Safety for bikes was mixed.
Roundabouts can be hazardous to bikes .
Need more research in how to design for bike safety . Not yet available for release. To be presented to TRB Jan 99. Will enhance ability to implement solutions. More cyclists need training in negotiating intersections safely.