This book summarizes the work on Personal Rapid Transit (PRT) carried out at the Aerospace Corporation from 1968 to 1976. It is intended as a reference for experts and a text for students of transportation engineering. Emphasis is on describing concepts rather than engineering details. PRT is an automated taxicab system, a public transit system of 3- to 6-passenger vehicles operating automatically on a network exclusive guideways separate from street and pedestrian traffic. The book reports on both theoretical studies about economics, networks, traffic management, vehicle propulsion and control and also on experiments testing concepts of propulsion and control.