Most of the issues with public transport can be solved with some careful planning. If you haven't seen it already, http://carfree.com/ http://carfree.com/ cover

Most of the issues with public transport can be solved with some careful planning. If you haven't seen it already, http://carfree.com/ http://carfree.com/ covers a lot of the practical ones (including how you migrate existing cities over to being car free).