The rationale against the centre St bridge is that it is old and may need reinforcement. There are few river crossings, so it is important not to lose capacity, particularly when others are under repair. Buses will also still use the corridor, so beyond cutting the lanes from 3 to 1 in rush hour, you also still have bus traffic, cyclists and cars. I think this decision would be incredibly short sighted and probably regretted very soon after construction on it starts.
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