Ответ:

Hello! My name is (...) and I'm going to talk about public transport.

Usually in big cities there is public transport. It is for people who haven't got personal car or motorbike. Often public transport is really crowded - many people prefer it. Public transport can be different. Now we use metro, buses, trams and rarely boats.

People usually prefer public transport because it is cheeper than personal transport and not everyone can drive a car for example.