I think they intend to temporarily re-route north bound traffic onto the overpass that they bolstered with a bulkhead and south bound traffic onto the road they are installing next to the bulkheaded overpass. This gives them the freedom to remove the other overpass (current northbound traffic), Once the overpass is removed, they will probably create new north and south lanes in place of the removed overpass. They then would have the freedom to remove the second overpass (with the bulkhead). Just a guess.
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