Traffic designers are excited about a new traffic interchange/intersection called the diverging diamond or double crossover diamond interchange. For a short distance of a major road, it switches the left and right sides, but then switches them back again. It is advertised as preventing dangerous left turns that cross oncoming traffic.
This weekend one is being implemented in Lexington KY. Check out the plans for it. And here is one from Missouri that has been implemented long enough to be photographed:
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While I don't know how well these really work, they make me wonder how many other daily urban and suburban problems we encounter that deserve create spatial solutions to lesson the conflict.