> As a driver merging into a roundabout I find I have far less cognitive load. What I've seen first hand in Ontario/Canada is that there's a huge increase in c

> As a driver merging into a roundabout I find I have far less cognitive load. What I've seen first hand in Ontario/Canada is that there's a huge increase in cognitive load simply because the roundabouts are still fairly new. Most drivers were never taught about them. They've just appeared. And they aren't completely intuitive for many drivers -- so their entry/exit isn't always ideal/safe.