The short story "
The Roads Must Roll" (1940), written by Robert A. Heinlein, depicts the risk of a transportation strike in a society based on similar-speed sidewalks. The novel is part of the
Future History saga, and takes place in 1976. Isaac Asimov, in the novel
The Caves of Steel (1954) and its sequels in the
Robot series, uses similar enormous underground cities with a similar sidewalk system. The period described is about the year 5,000.
In each of these cases, there is a massive network of parallel moving belts, the inner ones moving faster. Passengers are screened from wind, and there are chairs and even shops on the belt. In the Heinlein work the fast lane runs at 100 mph (160 km/h), and the first "mechanical road" was built in 1960 between Cincinnati and Cleveland. The relative speed of two adjacent belts is 8.0 km/h (5 mph) (in the book, the fast lane stops while the second lane keeps running at 153 km/h (95 mph)). In the Wells and Asimov works there are more steps in the speed scale and the speeds are less extreme.