You think round-de-bouts are bad. Wait untill you see this.

When crossing straight across in the OPs diagram is there adequate room for a big rig to stop in the center? With the toad I'm about 63'.

I have no hesitation to use 2 lanes if required in whatever situation. It's also common to see large rigs that are making a tight right turn to first swing left before turning right.

Only one time at my daughters CA house did I try to turn around at the end of the street and while successful I did jump the curb. From then on I backed down the street.