Friend and coworker of mine was recently in a deadly accident on her way to work on a scooter. Those vehicles are great but on a road that is still primarily built for cars (and is now inhabited by ever more massive giant pickups) it can be a serious safety risk.
you need to get people out of personal vehicles on onto public transportation
This is really the heart of it. It's an infrastructure problem. Frustratingly, this is the most difficult and time consuming problem to solve.