Anyway, your essay looks pretty short :)
Nowadays the matter of public transportation in many countries is a crucial part of nation's challenges. Some people believe that governments are under obligation to support public transportation whereas a large group of people flatly reject this idea. In this essay I want to mention some advantages and disadvantages of financial support of public transportation by governments .
.... Had your prompt asked whether you agree on that statement, then you better clearly state that you agree/disagree or partially agree. It is always better to express your opinion before concluding your intro.
Firstly, the advantages of funding public transportation by governments: Imagine major cities of the world without public transport network! How do people travel to work, to school and to see their friends and families? what are the effects? The answer is clear a city without public transport is a city that regularly grint to halt
Well, you essay looks like almost a speech :) If you are preparing for IELTS or TOEFL, then better you begin your body paragraphs with the reason as to why you hold a particular opinion. Then you should support that reason with a specific example. Also, you should have one reason per body para :)