Yes traffic lights can be far better in heavy traffic - at least everyone gets a turn. In some roundabouts I've driven through, where there is a "main" way the

Yes traffic lights can be far better in heavy traffic - at least everyone gets a turn. In some roundabouts I've driven through, where there is a "main" way the cars coming from the other directions often get locked out as people queue through it. It works out if people have some courtesy and take turns but that's not always a good basis for traffic planning.