We all here want more public transport in our societies and see cars as inefficient and expensive. I wonder if anyone knows any research or well thought-out article about how much it would cost to run a society/city to have a lot of public transport, and how much that would save.

If I think about how in a political campaign it could be (financially) convincing. Let's say that taking, say, 1000 USD/EUR/GBP(etc) more in taxes per person per year, would be estimated to save a person 5000 USD/EUR/GBP(etc) per year in their car cost, medical cost, other societal cost like the parking space. I am curious if there is literature or even just blog posts about someone going into detail about this and detailed (and real life preferably) calculate and estimate these statistics.

To reiterate, I am curious about the numbers and economics of this in as real of situations as possible. How many bus routes would need to be added and how much would that genuinely cost at a level where people can stop buying cars.

I love traveling, and also enjoy planning for it. But I do often find that searching many different sites with basic filters becomes quite cumbersome. I had the idea of adding more advanced features to be able to better pinpoint what exactly the best option would be for each person specifically. It initially started with Flixbus having no "what is the cheapest connection somewhere in May" feature, like Google Flight does have. But I wanted to add more things. I have added that you can add how much it's worth for you to travel an hour less, or a transfer less, or not arrive/depart in the middle of the night. This will then be taken into account when sorting what is the best connection instead of the cheapest. It also already has a search for Flixbus on what the best connection is in a range of dates, and what the best connection is from a place to any place in the desired country. I want to add too that it takes hostel/hotel prices into account, so that you can say you want to go from Berlin to anywhere in Czechia, for 4 days, and it actually gives you the complete best route to a city with a cheap hostel too. I would love to add more things and am very curious about desires from other travelers for a tool like this, so what do you think and would you like to add?