https://en.wikipedia.org/wiki/Induced_demand#Studies

See also 'reduced demand' on the same page.

1. massively over-supply options better than cars
2. people avoid car hassle
3. shrink lanes
4. repeat

But that first step is the killer: I found in my own experience that my transit commute had a maximum bus tolerance of 15-30 minutes (based on traffic) or I'd just not do it. I can ride a train for an hour, but have me sit in traffic on a bus and it's "fuck no".