"about a quarter of all crash fatalities happen at intersections. So how do roundabout and non-roundabout intersections differ on fatalities? Looking at U.S. crash data from 2017 to 2019, you see that 0.1 percent of crashes at roundabouts result in a death. That could be the death of a driver, passenger, pedestrian, cyclist, anyone. 0.1-percent: that’s 1 death per 1,000 crashes at roundabouts. Okay, and how about your standard, four-way intersection, with traffic lights or stop signs? The death rate there is 0.4 percent, or 4 deaths per 1,000 crashes."

Lighted intersections are 4 times more deadly than roundabouts.