Well, sure, if I knew to even ask the question, I might have found out in advance. (And maybe not, since the Golden Gate Bridge went cashless just a month or two before it caught me.) But even if I knew, did I really have any alternative to get back to SFO? Only an idiot would drive all the way around SF Bay to approach the airport from the south. Is the SF Bay Bridge also cashless? I have no idea.
Anyway, the point here is that these new, high-tech cashless toll roads are a nightmare for people in rental cars. That remains true.
Bruce