A third road crossing?
I think there should be another road tunnel, and the 2 Eastern lanes on the Harbour bridge RETURNED back to rail.
The road tunnel would replace the Western Distributor bridge, which is removed. The tunnel would go from Sydney Aquarium to where the existing tunnel entrances are at the Warringah Fwy. It would be 6 lanes.
The 6 driving lanes of the Harbour bridge would be for Sydney CBD only (WD bridge is completely removed).
There would be 4 rail lines, in a similar configuration to how the bridge was originally designed.
Of course this would cost billions, and would require the NSW government to agree to some generous tolling concessions to convince private enterprise to get involved.
^ so you'd be removing the Western Distributor as between Grosvenor Street and Day Street? (only?) And traffic that is headed for the middle or southern end of the CBD and would ordinarily exit at Day Street?
Yes remove the bridge part of the WD. If required a tunnel entrance/exit for north syd could be built where Erskine St currently goes under the WD bridge (if necessary close Erskine St all the way to Lime St).