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I recently returned from a trip which included an early morning taxi ride from downtown Nairobi, Kenya to the airport, travelling the opposite direction of the majority traffic.
As we sat in gridlock, the driver grumbled that traffic moved smoothly until they put in these (expletive deleted) roundabouts.  Sure enough, as soon as we got through the last of them, we were able to move along without impediment even though the number of cars on the road had not diminished.
 My take-away from this experience is that the folly of trying to use roundabouts inappropriately is a global problem.
Peter C. LaDelfe
Los Alamos