Mythbusters tests how many cars you can get through a roundabout vs a 4 way stop.
Mike the traffic engineer notes that 4 way stops are cheaper, but if you need to bump up the throughput, roundabouts are the winner.
Bike people like you and I are split on the safety of roundabouts for cyclists and pedestrians. Many people don’t like them. I’m okay with them for low speed roads, like the one we have in Santa Cruz, California where Center Street and Pacific Avenue come together near the wharf.
Via Carson Blume.
Update: I just noticed this post that goes into detail on the safety of roundabouts for pedestrians and cyclists via Streetsblog. Alex Inhan notes the Mythbusters video focuses only on level of service with only the briefest gloss on safety. Alex goes into more transpo geekery by talking about conflict points in the four way intersection vs a roundabout. “Conflict points” is a shorthand way of counting the number of places you need to look to avoid hitting something when crossing an intersection.