I've lived in Shanghai (China) for many years and there were also many traffic problems. There were traffic jams everyday and the air was quite polluted. It was very dangerous to cross the street because not everyone would obey the traffic rules. It's intersting to read about the hawkers in Kolkata. We don't have hawkers on the street in Germany. The biggest problems in Germany are that almost everyone owns a car and even drives short distances by car and that people like to drive with high speed on the highway. There are places, where there's no speed limit.
It would be good if you posted your text in the notebook section to receive corrections, for example like this:
I live in Kolkata. Here we face traffic problems every day. There are many reason such as hawkers, who ...
I'm not a native English speaker, so I'll leave it to more competent people to correct further.
in Jakarta, the capital city of Indonesia, traffic is the big problem that still haven't been solved by government. there are some reasons
the interest of using public transportations is low and some of them prefer to use private vehicles then public transportations, the increasing of vehicles is not equal with the increasing of the roads, there are 6000 new vehicles everyday, and sometimes because of the bad weather