Ah but sys a 4 way stop is not a traffic light!
True, a 4 way stop is not a traffic light, but it is a traffic semaphore.
A person directing traffic at an intersection is also a traffic semaphore. And it was interesting to see the results of traffic flow with a person directing traffic within the MythBusters segment. It would have been interesting to see a test using traffic lights within their piece, but they didn’t do it. My guess is that they view a four-way stop as an alternative to the European roundabout and not traffic lights.
I guess the question they are answering is what, if any, are the opportunity costs of using a 4 way stop vs. a roundabout.
Given the incredible amount of traffic we all seem to face, it would interesting to know, at least in theory, if one solution is substantially better than another.