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Signalled intersections are likely a lot worse for pedestrians and cyclists, as non-compliant drivers can navigate them at much higher speeds. On account of its shape, it's impossible to blast through a roundabout at, for example, 100 km/h.

Combine with raised pedestrian crossings and you have natural speed bumps reducing car speeds even further at the potential point of conflict.

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Yeah slowing down cars "naturally" by using narrower roads and roundabouts, and then built lots of non-signalled pedestrian crossings (sometimes with bumps) have been a trend for some time. The data seems to support it works.

I think the complaint here is about larger roundabouts that tend to admit higher speeds and have a large radius, not low-speed tight circles in dense mixed-use areas.

For those kind of roundabouts you add signals to the pedestrian crossing. Although above a certain size tunnels or bridges becomes justifiable, but then we are pretty far from urban environments.

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