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Ian Jackson[_2_]

In message ,
writes

Since both the roundabout and the 4 way stop usually are installed to
slow traffic down (in the US) , not to make it go faster, I am not
sure what myth busters proved.
The most efficient traffic movement in high traffic areas is obviously
vertical separation but the next choice is a system of well timed
lights.

Yes, when your reach a roundabout, it does temporarily slow you down
(even when the traffic is flowing well) - but with luck, nobody actually
stops.

However, even the best system of well timed traffic lights is almost
certain to bring someone to a stop. That's what the lights are there
for!
--
Ian