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Hearing stories from countries with relaxed regulation where lifts/elevators haven't been coded correctly and end up shearing body parts off because it moved without the doors closing, for instance, reminds you that they are a machine that goes up and down. They don't know that the added resistance is a body part in the way. The motor will just continue to turn. The only reason it's so safe in developed countries is because they have hundreds of sensors to ensure nothing is in the doorway, and that the does have closed, before moving. It makes them more expensive, but that ensures we using them without having to be vigilant of a machine that can't differentiate body parts from it's normal operation.
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