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Self-preservation is much lower on the scale of things to give a shit about in Oz. We were still doing dead-turn TTs when I left.
Most of the wildlife can kill you but there are so few people that you're unlucky if you see a car from one hour to the next; that's bound to have an effect on the TT and Tri regulations. You wouldn't want to do either an open water swim or leave your shoes unattended in transition, but a U-ey on a major highway is pretty risk free :-)
Which is why we don't do them any more. I'm just about old enough to have done a U-turn in a club event, but they were already banned in opens.