At 08:23, 09:24, and 10:24 are small shacks, tollbooths allowing you to use the SF bridges for 100 (?). It’s the same toll going either way. You pay the toll, then are magically whipped away to the other end, at another tollbooth, where you “could” pay to cross back. (Totally based on the real SF bay/golden Gate bridges, except that they are toll one-way only.)