The law and order at the city center after 9 p.m is to ensure a safe and secure city for the occupants.
This refers to a situation where the laws of a country are being obeyed and been enforced on the citizens by the police or army.
In the city centers, the law and order are intended to ensures orderliness and a crime free society, hence, the police could order a curfew at 9pm in order to have a secure control of the city.
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