An elevated solution would also be extremely disruptive. It involves closing what's below it during the work, though with some methods you might reopen areas during off-hours. Large staging areas would be needed. You have to clear the existing overpasses, meaning you're way up in the air and need long ramps to get there. Prefabbing can be limited to areas right next to big fab/staging areas.
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"Alot" has never been a word.
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