One big advantage is that you get much more use out of public transport. I'm well served by trams where I live but there are many times when it would be conveni

One big advantage is that you get much more use out of public transport. I'm well served by trams where I live but there are many times when it would be convenient to travel just one or two stops. It is too expensive to even consider it for short journeys. From the article. it looks like Tallinn requires residence permits or something. So perhaps they still need a fare system. I'd make all local public transport free for anyone. May even avoid the need for the diesel car bans being mooted in my city (and some other German cities).