In 1988, BFJ began designing modern roundabouts for the Public Works Administration of Luxembourg. Since then, BFJ has played a significant role in introducing modern roundabouts to the United States, writing the Synthesis on Modern Roundabout Practice in the United States for the Transportation Research Board, participating in the preparation of the Federal Highway Administration's roundabout guide, and writing the roundabout chapter in Toolbox on Intersection Safety and Design for the Federal Highway Administration and the Institute of Transportation Engineers. BFJ has undertaken numerous roundabout feasibility studies, including the conceptual design of the roundabout and its critical geometric elements; and the analysis of its performance in terms of delays, queuing, and safety.