1.When answering this question, consider the reasons why people might talk loudly on public transport. Some people may not be aware of their volume, especially if they are engaged in an exciting or emotional conversation. Others might not realize how their voice carries in a confined space. 2.You can also discuss cultural differences, as norms regarding public behavior can vary widely. Additionally, some individuals might talk loudly due to hearing impairments or because they are using headphones and are unaware of their volume. It's also possible that some people are simply inconsiderate of others around them.