Do you know where the emergency button is on an escalator?
Accidents can happen quickly in life. The important thing is always to be able to act with presence of mind in dangerous areas. But we humans often aren't and get caught up in our thoughts, don't pay attention to other people and are detached from the present reality or are not aware of how quickly things can happen. With escalators, you might not know what devastating accidents can happen. Focusing on and being aware of what is happening real at the moment is the highest chance of preventing accidents.
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