Rule 1: be filled with Japanese people Cities and any polity or group of people cannot be created by some abstract rules or enforced. You need it to be composed of individuals who are disposed to act harmoniously with each other and have a culture (which is basically a bunch of jigging to aid harmonious interactions, you cannot create top down the manners you don't want people to violate). Everyone acting in their ow…
Singapore is a multi-culturial society and it is also known to be very safe and clean like Japan. You can definitely make people behave with top down rules, and eventually it just becomes 'culture'.
Authoritarianism has a bad connotation in Western societies based on individualism.
In Japan, the authority is the group and social norms. In Singapore, it’s the BDFL. This involve restricting individual freedoms for the greater good. This would never work in America.