[rdiddly]

I'm only comparing what happens in the world we have, where Uber & Lyft exist, vs. what would happen if they didn't, or would've happened back when they didn't. Obviously some of this is guesswork kind of like "Gee what would've happened if I'd married my high school crush" or whatnot. But in general if you would've walked or biked to transit before, and now you take Uber & Lyft, that makes congestion worse. If you would have driven to transit, using Uber/Lyft has no effect. If you would have driven the whole way, it's a partial improvement (by riding transit for that one segment).