What will happen to us, the author must have asked himself, if we continue to ride in cars for centuries to come? You may laugh at the idea that we will lose the use of our legs entirely, but the idea is not as foolish as it may sound.
There is excellent science in this story, and if you do not believe that too much riding in cars is bad for you, just speak to your doctor and get his advice.
Here is a story worth reading because many of the things of which the author speaks are gradually coming about. There was a time when pedestrians had certain rights. In our large cities, however, these rights are practically lost even now.