
The original Beijing subway was prevented by placing flat metal sign boards in the middle, but only one sign board was placed in an elevator. The remaining length of the elevator was still dangerous for the slides, but too many text prompt boards were used for ordinary people. It is easy to cause irritation. So the method of using a small semi-circle ball, there will not be a major problem with frequent placement visually, but people who want to slide will immediately think of how much pain in the buttocks.
In addition to preventing anyone from playing on the slide, it is more important to prevent some bastards from loading heavy items such as suitcases on top of high speeds to get to people. .
Personally think that this is a good tip design, effective in the eyes of the effective audience, disappearing in the eyes of the invalid audience.
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