你好，jasonpisk49929015、

在 "Highrise City"，所有服务对市民都是免费的。公共交通就是一种服务。
您可以依法对某些服务收费。我认为依法对公共交通收费是个好主意。
谢谢您的建议。

in "Highrise City" all services are free for citizens. Public transport is a service.
You can make some services chargeable by law. I think that is a good idea to make public transport chargeable by law.
Thank you for the idea.