According to AFP:
Japanese joggers are being warned to mind their manners when they run around the Imperial Palace in central Tokyo, after a 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.
While the emperor’s official residence is strictly off-limits, large parts of its sprawling grounds are open and provide a welcome green lung in densely-concreted Tokyo, attracting around 10,000 runners every day.