On today's episode, Donnie admits to being wrong about the effectiveness of roundabouts.  Below is some of the evidence that changed his mind.  Being wrong is tough, but freeing! We hope you enjoy the episode!1. Examples: Studies of reduction in traffic delays:Retting, R. A., Luttrell, G., & Russell, E. R. (2002). Public opinion and traffic flow impacts of newly installed modern roundabouts in the United States. Institute of Transportation Engineers. ITE Journal, 72(9), 30.Retting, R. A., Mandavilli, S., McCartt, A. T., & Russell, E. R. (2006). Roundabouts, traffic flow and public opinion. Traffic engineering and control, 47(7), 268-272.2. Examples: Studies of reduction in traffic accidents and accident severity:Retting, R. A., Persaud, B. N., Garder, P. E., & Lord, D. (2001). Crash and injury reduction following installation of roundabouts in the United States. American journal of public health, 91(4), 628.Eisenman, S. M., Josselyn, J., List, G., Persaud, B., Lyon, C., Robinson, B., ... & Troutbeck, R. (2004). Operational and safety performance of modern roundabouts and other intersection types (No. Project SPR C-01-47). New York State Department of Transportation.Isebrands, H., & Hallmark, S. (2012). Statistical analysis and development of crash prediction model for roundabouts on high-speed rural roadways. Transportation research record, 2312(1), 3-13.Elvik, R. (2017). Road safety effects of roundabouts: A meta-analysis. Accident Analysis & Prevention, 99, 364-371.3. How Use of Roundabouts Changes Opinions:Retting, R. A., Luttrell, G., & Russell, E. R. (2002). Public opinion and traffic flow impacts of newly installed modern roundabouts in the United States. Institute of Transportation Engineers. ITE Journal, 72(9), 30.