There are so many variables that factor into the success of public transport that direct comparisons between different countries are of minimal use. Its going to depend a lot on how safe the public transport is, how well it connects commuters to places they need to travel between, how inconvenient the roads and accommodation are for owning cars, etc. etc.

The sane thing to do is to experiment with a pilot program and adapt for the local context. Even then there are many problems to weed out with experimental biases and sampling issues, etc. - but it is less terrible.