> Have you ever tried to cross one?

I do so almost every day. Pretty much every roundabout has marked crossings with islands between the lanes, drivers slow down on entry so easily yield to a pedestrian trying to cross, and the crossing is about a car length out of the roundabout so on exit drivers have the space to both be out of the roundabout and yield to pedestrians.

Then again I’m in a country where drivers are generally respectful of pedestrians, especially on marked crossings most drivers will actively stop if they see a pedestrian getting close to a crossing.