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 foun

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