https://www.vancouverisawesome.com/local-news/5-things-you-probably-didnt-know-about-the-burrard-bridge-7129420 The BSB used to have 6 lanes, but was reduced to 4, because the city didn't want to build a parallel bike bridge.
https://vancouverhistory.ca/places/burrard-bridge
Hopefully, the VMV will never cause the removal of 2 lanes from the congested 6 lane Second+Narrows+Bridge.
https://vancouverhistory.ca/events/collapse-of-the-second-narrows-bridge
https://jfdatalinks.blogspot.com/search?q=Burrard+Bridge A parallel bike bridge could allow the BSB to have 6 lanes again, with 2 of them for buses.
https://jfdatalinks.blogspot.com/search?q=Second+Narrows+Bridge A parallel express bus or BRT bridge with 2 truck lanes and 2 LRT tracks would greatly improve crossing capacity.