The Tallinn experiment: what happens when a city makes public transport free?
http://www.theguardian.com/cities/2016/oct/11/tallinn-experiment-estonia-public-transport-free-cities?CMP=Share_AndroidApp_WordPress
UPDATE: Just to be clear, even though it is clear that some parts of this experiment may not be financially sustainable in the long term – in the current circumstances – I am still a big fan of making public transportation more accessible. Perhaps if some of the funds that so often gets spent on building bigger highways got redirected to public transit, the financial situation would look different. 🙂