The city of Laguna Beach is considering a plan to include traffic roundabouts on Laguna Canyon Road at these traffic intersections: El Toro Road, Phillips Road, Anneliese Schools. The video shows an experiment where roundabouts increased car traffic flow by 20% over 4-way stops and increases car traffic safety. The result does not consider other transportation modes through the same intersection. The city's plan does not consider other transport modes in their measure of plan success. Don't we have enough cars already?
For contrast here's a working roundabout in Amsterdam.