Earlier quoted context omitted.
> BART along the same alignment still moves 2x more people than the Bay Bridge does though, which is something to remember as non-users of BART clamor for its defunding. How much does BART cost per year (or per decade) vs the Bay Bridge? A huge advantage of roads vs public transit is you don't need staff. (Maintenence is needed on both, but even then I suspect roads are cheaper to maintain.)
Also the drivers fund the heavy moving equipment which is a huge subsidy for the roads. The BART has to pay for everything out of fares and sundry. The highway authority just has to build and maintain the road not the vehicles.
And costs like the drivers and station workers is just split over the 1-per-car drivers across an equivalent road. I don't know anyone who enjoys that commute, likely arriving more stressed rather than less, and you can't read or prep for your real work in any way when driving.
It's a common fallacy to ignore relatively small per-person costs, even if the total adds up to a massive amount due to the numbers of people.