Very difficult problem, and very costly engineering project to solve. Major issues include maintenance of drainage patterns, accommodation of traffic, and much more. Tunnels would be an option to traffic signals, but again, enormous expense. Extensive permitting requirements also. And best case scenario would take years before completion of construction. It's much easier and cheaper to design something like this during concept development than it is to retrofit.
None of this is intended to discourage attempts to deal with the situation. But there are no quick and easy solutions.
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