Cities will be provided with moving street-ways, always in action at two or more speeds; and we shall have learned to hop on and off the lowest speed from the stationary pavement, and from the lower speeds to the higher, without danger. When streets cross, one rolling roadway will rise in a curve over the other. There will be no vehicular traffic at all in cities of any size; all the transportation will be done by the roads’ own motion.

— T. Baron Russell, A Hundred Years Hence, 1906