A lot of flap in the news again about roundabouts with the imminent Costco opening. I should offer upfront that I'm a fan of roundabouts in general.
Here is the educational diagram put forward by city and governments, for the double lane variety.
The incident that happened to me recently, can be visualized by looking at the red and blue cars at the top of the diagram.
I played the part of the red car going straight (with signaling). The part of the blue car was played by a pickup truck that decided to continue around the loop and almost drove me into oblivion.
One can opine about the responsibility of drivers to educate themselves, but if I was a visitor from around the bay, I don't think roundabouts would be 'top of mind' for my daily reading. Not sure what the answer is.