This presentation is a summary of some of the key lessons the author has learned in 14 years of planning and design of roundabouts in the USA. It provides a good general overview of many different aspects of design and operation of roundabouts. Included in the presentation are select results from an on-line public survey on roundabouts, which had over 3000 respondents.
THIEKEN, S. (2017). Roundabouts Lessons Learned. Presentation at the 5th TRB Urban Street Symposium, Transportation Research Board, Raleigh, North Carolina, USA, May 2017.