BART's budget is not funded by San Francisco. I think there are many sources of funding such as bridge and highway tolls which should be explored to shore up BART operating budgets. In addition, BART should abandon boondoggle capital projects like the monstrous tunnel VTA is proposing in the San Jose extension to invest in ways that improve service on existing lines. Finally, it is more than reasonable to redirect highway spending to transit.
That sounds reasonable enough, thanks. It looks like tolls generate ~750M currently and BART shortfall is ~330M. So, it's doable if we're able to push through an increase of 50% on tolls.
I wasn't able to easily look up our highway spending budget.