The only places where a 4-way stop has room to make a roundabout are places where there is not enough traffic for it to matter either way.
The biggest obstacle is that there are just too many 4-way stops in urban areas where there is no space left to make a roundabout, you would have to tear down buildings. I don't think that is a valid argument in that scenario.
The biggest obstacle is that there are just too many 4-way stops in urban areas where there is no space left to make a roundabout, you would have to tear down buildings. I don't think that is a valid argument in that scenario.