Please share your information about cities with free public transport or organizations that are working for a free public transport with us! As soon as we get the information we will post it on the site. If you can, please provide us with a link to a site (preferably official one) with more information about the city with free public transport!
If you’re looking for research done on the subject, we’d recommend you to start with this paper, and then if you’ve got more questions feel free to reach out to us. :)