Highway expansion is already here in many areas! Waymo has been laying the groundwork for this rapid rollout for so many years and it's amazing to see it all come together.
You /should/ be able to save by using shared rides, but in practice when I tried the driver was so mad they just dumped me on the side of the road and I had to call and get a refund.
The new Caltrain schedule isn't half bad though, if it came twice as often on the weekends we'd be cooking.