News Tokyo’s oldest koban watching over Roppongi

To accommodate an increasing number of foreigners in the capital, the MPD introduced a sign with koban in the alphabet in 1995. Japan has also exported the koban system to help other countries protect public safety. Singapore opened its first koban in 1983, and the Sao Paulo state police in Brazil adopted the police box system in 1997 to improve security in slum areas. Indonesia and Cambodia have also introduced the system, according to the Japan International Cooperation Agency.

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It is often stated that the kōban system was inspired by the Continental European model of policing that aimed at extending the government's reach "into every town, village and hamlet", a system that required a high-level of dispersion of police forces. The Prussian model drew the attention of the Meiji oligarchs. The Prussian Police official Heinrich Friedrich Wilhelm Höhn was an adviser to the Japanese Home Ministry from 1885-91. After his inspections of local jurisdictions from Aomori to Kagoshima, he recommended an increased diffusion of police forces to allow for more effective surveillance of the urban and rural population. The residential police stations (chūzaisho) were to serve as "snail feelers" (蝸牛の触角 katatsumuri no shokkaku), always alert and ready to react to a potentially unruly populace.

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