Well. Since it is capital all important headquarters, ambassadors all gather here. So Security is more strict. Pretty much local you see are politicians or people working for government, or visitors. Civilians choose to live around and outside capital rather than in capital. Imagine you on your way to work then the traffic stop because of Emperor of England or Prime Minister of Japan visit. Well you will be late for sure. All the road will block due to their safety. Capital is a face of a country. Don’t you agree? 😊😅