> An other baffling design I've encountered in the UK is a roundabout with traffic lights half-way through.. Wasn't the concept based on removing traffic lights

> An other baffling design I've encountered in the UK is a roundabout with traffic lights half-way through.. Wasn't the concept based on removing traffic lights to fluidify traffic..? This is indeed a weird one from a US perspective. The way to think about it is not as a roundabout with traffic lights, but as a light-controlled intersection in the shape of a roundabout. A roundabout-shaped intersection can handle more variations than a normal intersection, you can have more than 4 roads, or roads entering at odd angles. As for what the advantage is of having lights on the roundabout as opposed to on the approach, I have no idea.