The current bridge is 4 lanes, two on each side, with a really narrow sidewalk on each side, and very steep, that you cannot ride a bicycle on. People have to push their bikes over it. And it’s difficult to pass someone coming in the opposite direction.
The new bridge will be three lanes on each side, a separated median, with wide walkways and a bike path on both sides.
They need to add at least one special bus line each way.
So 3 car & truck lanes on either side, one bus lane on either side, one wheelchair lane either side, one bike lane either side, one pedestrian lane
that makes 8 vehicular lanes unless they need to have a dedicated hazmat trunk lane on either side as well. So call it 10 lanes, then 6 more lanes for the unfortunates without a vehicle.
Presto chango! A 16 lane bridge, all for a low low cost of $4 billion, before cost overruns.