As far as the round-a-bouts are concerned, I read an article several months ago that talked of a study that showed that compared to stop signs, round-a-bouts reduced accidents by 80% and also reduced accidents compared to stop lights. They kept traffic moving, and when there was an accident it was much less severe than someone running a stop sign or light. Accidents in a round-a-bout were usually just a glancing blow and not a full t-bone collision which is more severe.
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Les
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