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While rooftop squares importantly serve as evacuation spaces in disasters and other emergencies, Tanaka said that it is ideal for there to be walls or fencing at least 3 meters tall -- high enough to not be possible to climb over -- to prevent falls. 

Aside from physical measures such as not placing planters or other items that could offer a foothold close to the walls, Tanaka said, "It's important to minimize incidents even a little bit through measures such as increased patrols by security guards and adding AI capabilities for security cameras to detect suspicious behavior."

https://mainichi.jp/english/articles/202...na/009000c