Japan’s cluttered streets are not always pretty but they are remarkably safe. Crime rates have been falling for 13 years. The murder rate of 0.3 per 100,000 people is among the lowest in the world; in America it is almost 4 [per 100,000 people]. A single gun slaying was recorded for the whole of 2015. Even yakuza gangsters, once a potent criminal force, have been weakened by tougher laws and old age, reports the Economist.

Yet, far from being pensioned off, the police are growing in numbers: beat cops, known colloquially as omawari-san (Mr Walk-around), are a fixture in most neighbourhoods. Japan has over 259,000 uniformed officers—15,000 more than a decade ago, when crime rates were far higher.

As the police run out of things to do, they are becoming more inventive about what constitutes a crime, says Kanako Takayama of Kyoto University. In one recent case, she says, they arrested a group of people who had shared the cost of renting a car, deeming the arrangement an illegal taxi. Some prefectures have begun prosecuting people who ride their bicycles through red lights.