[IrishBrigade]

‘Traffic circles or roundabouts are far safer and more efficient in terms of average flow speed for all but the busiest intersections.’

anything more than a moderately busy turn circle is a death trap...

[Regulator]

Nonsense. The Institute of Transportation Engineers disagrees with you among others; you can read the basics here: Mythbusters and the ITE paper here.

You're free to refute using some hard data and the appropriate flow coefficients.

[cuban leaf]

anything more than a moderately busy turn circle is a death trap...

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In what way? My experience is that the traffic is not flowing fast enough to result in anything more than, at most, a serious fender bender.

FWIW, I’ve watched hundreds of crash compilation videos. I’ve seen a LOT of obviously fatal accidents at standard intersections, but not a one at turn circles. There simply is not enough kinetic energy involved and, most importantly, the cars are all going, in essence, the same direction.