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In Seattle we already have these.
In my experience, they do help to reduce accidents due to traffic congestion and limited visibility (they are placed on the rolling hills you drive on as you enter the city from the south on I-5). But, I have seen no effect of reduced congestion at all. And if we didn't have limited visibility in the area where traffic goes from high speed to a snarled mess, I don't think we would see any benefit at all.
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