Japanese joggers are being warned to mind their manners when they run around the Imperial Palace in central Tokyo, after a recent spate of rudeness.

Officials say tourists and older visitors to the grounds have complained of runners crashing into them from behind and then trotting off without saying sorry.

“In some cases, the victims were jeered at or yelled at by joggers,” said a Chiyoda Ward official.

The palace is in the ward.

While the Emperor’s official residence is strictly off-limits, large parts of its sprawling grounds are open and provide a welcome green respite in densely concreted Tokyo, attracting around 10,000 runners every day.

Chiyoda Ward officials, who say they have received around 100 complaints in the last three to four years, have now erected signs urging joggers to observe the rules: Yield to pedestrians, run counterclockwise and be polite.

Japan’s strict codes of behavioral conduct, which govern everything from riding the subway to using a public bath, are routinely reinforced by signs or noticeboards filled with do’s and don’ts.

While some older Japanese bemoan slipping standards of behavior, public confrontations and outright rudeness remain very rare, even in densely populated Tokyo.