Transportation from the domestication of the horse and the first raft to the SST and BART, with a special emphasis on the pros and cons of the automobile and the competition between public and private systems of getting around. Halacy maintains a strong anti-pollution stance throughout; however, he is pessimistic about the chances of ever convincing people to give up the joys of the automobile for mass transportation, and his blueprint for travel of the future rests on a continuing faith in the capacity of technical innovation -- automated highways, etc. -- to solve the very problems it created. Otherwise, a decent enough effort limited by the missed opportunities and long chronological recapitulations endemic to this kind of macroscopic view.