https://trimet.org/budget/pdf/2026-adopted-budget.pdf
Tax revenue was $555mm
https://trimet.org/about/pdf/trimetridership.pdf
~122,300,000 rides (originating + boarding)
So about $4.53 per ride.
The Portland metro is ~2.5mm people, so about $222/resident/yr.
Portland metro area residents pay on average about sixty cents per day to subsidize TriMet.
Roughly 1/43rd the average cost of ownership for a new car in Oregon.
https://info.oregon.aaa.com/how-much-does-it-really-cost-to-...
Assuming an average fare of 2.47$ per to make the math even, that's 6.00$/ride total cost.
When a company / government gets the cost per mile to run a fleet of autonomous EV's down to ~60cents/mile or so, which is a plausible enough number, then a lot of those transit rides are going to look real silly from a cost effectiveness POV.