I know this is not the case in the US but here, it is common to have public transport on the country side as well to some degree. Most villages have bus transport. Yes, there is a lot more in the city but it grows with density.
> 2) When things are 'free' we tend to use them in a way that does not reflect their true cost. Imagine if toilet paper were 'free' for everyone. We'd probably use a lot more of it, unnecessarily so.
I do not think there is such thing as an excessive/unnecessary use of public transport when the alternative is to use a car which pollutes the planet. I cannot imagine using the tram in cases where it would be unnecessary, but maybe thats just me.
If it is in the interest of the people to get rid of cars, offering public transport at no cost is not so far fetched, considering the amounts of money we will have to spend to combat carbon in the air and are spending on road systems.