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You could have multiple conveyor belts in parallel, running at different speeds, so that the difference between them is not too much.

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This is an old science-fiction idea, Robert Heinlein's _The Roads Must Roll_ was published in 1940. When I looked this up to get a date for the citation, I found that H. G. Wells used the idea in 1910 as well.

https://en.wikipedia.org/wiki/Moving_walkway#Slidewalk

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