safer for all parties

If you were a pedestrian who had to walk through one of those designs, I guarantee you would not feel very safe.

The problem with traffic engineering is that it's solely concerned with vehicle traffic. Making roads safer and easier to drive on for cars actively makes them worse for everyone outside a car.

the idea that you can design safer traffic patterns isn't a bad idea. the idea that you can come up with some super efficient method to solve traffic in cities is. cities in asia literally were like "if your license plate starts with [x] you can't drive in rush hour on this day of the week". it led to car manufacturers selling more cars so that people could keep driving in rush hour, instead of any semblance of less traffic on the road

https://www.vice.com/en/article/odd-even-scheme-coding-traffic-worse-asia-philippines-indonesia/

The more people drive, the more we all die. Even if you manage to engineer an intersection where no one gets run over, it still causes hurricanes, droughts, flooding, etc. It's all still enabling yet more bad behaviour.