Abstract
This report describes a research study to define the social and economic factors effecting intercity travel and to use the resulting relationships with existing traffic prediction tools to predict intercity travel. The basic data used in the study were the external origin-and-destination surveys of 22 cities. In addition to the surveys, a second source was the U.S. Census, from which a series of 14 commonly available social and economic factors were selected. The trip data from all the O-D studies were summarized by trip purposes and by increasing time rings from the study area centrist. A stepwise regression analysis computer program was used to determine the relationship between trips and social and economic data.