Car C is really just waiting for the pink car to arrive so that they can slam the gas as soon as it does.

Right, that’s the funny thing about roundabouts. They’re a marvelous solution to local motor vehicle throughput. That become completely unnecessary if your traffic is anything besides motor vehicles. In fact, for bikes and pedestrians and anyone else who can look at each other eye to eye and even just talk to one another if need be, no signals or signs are necessary at all.

I’m a daily cyclist and I think I’d be terrified to bike through a full roundabout. They’re absolutely marvelous designs for throughput that doesn’t require complex signal automation, but the flip side of that is they’re pretty hostile if you’re not a motor vehicle. Any truly good roundabout design should include pedestrian and cycle paths along the periphery that have priority when crossing the circles entrances.

It’s really five regular roundabouts circling one central roundabout.