Shot at Yasukuni Jinja, a Shinto shrine in Kudan, Tokyo.
A bulletin board was erected in the middle of the approach way of this shrine. A Torii and a gate were seen on the other side of the notice. 'Dismount' was written on the board. Because it is the sanctuary, it is necessary to dismount here. And anyone who wants to visit the prayer hall has to head on foot from here.
This kind of manner has a long history. It was written as a rule in a law book called Hososiyosho, which was written about 800 years ago. According to the book, people had to alight from a horse when they met any royal personages in the streets. And people got a caning when they broke the rule.