Studies and evidence points to circles being safer and more fluid for traffic flow. The larger, the more flow. As cars near a circle they need to slow down, fo

Studies and evidence points to circles being safer and more fluid for traffic flow. The larger, the more flow. As cars near a circle they need to slow down, follow the rules and allow some error. Being more cautious prevents more crashes and allow for more flow. Automatic signals can be wrong, and promote reckless behaviour, confusion, less flow and more stops. UK is all circles, with most of Europe following.