> They work where each direction has an approximately equal amount of traffic. However, usually, one direction (north/south, say) has a larger share of the tra

> They work where each direction has an approximately equal amount of traffic. However, usually, one direction (north/south, say) has a larger share of the traffic. In those cases, the bulk of traffic all needs to slow down, downshift, turn a bit in one direction and then turn a bit in the other direction for the minority of traffic that's bleeding on or off the main artery. In those cases, a traffic light is better because the timing can be adjusted to the proportion of traffic from each direction (and more flexible since it can be adjusted over time). I'm not convinced of this either. It may make sense when considering one intersection in isolation, but over a corridor with ten intersections, you are going to get caught in a red light at least once, and that one full stop will cost you more than all the gains you get from not having to slow 10 mph through each intersection. This is setting aside fuel efficiency and safety considerations which also favor roundabouts, IMO.